This post contains a total of 10+ Hand-Picked Python Prime number checker Program Examples with Source Code. All these prime number checker programs are made using Python Programming Language.
You can use the source code of these examples with credits to the original owner.
Related Posts
Python Prime Number Checker Programs
1. By David Ashton
Made by David Ashton. A simple Program to check if a Number is prime or not prime. Source
12 12 is not a prime number. 12 is divisible by 2, 3, 4, 6.
def is_prime(n):
"""Check for prime number."""
if n > 2 and not n % 2:
return False
return all(n % i for i in range(2, int(n ** .5) + 1))
n = int(input() or "360")
print(f"{n} is{' ' if is_prime(n) else ' not '}a prime number.")
if not is_prime(n):
divisors = (str(i) for i in range(2, n) if not n % i)
print(f"{n} is divisible by {', '.join(divisors)}.")2. By Kuba SiekierzyΕski
Made by Kuba SiekierzyΕski. The code checks if a given number is prime using RegEx matching. Source
Number to be checked: 10 10 is not a prime
import re
def is_prime(n):
return not bool(re.match(r"^1?$|^(11+?)\1+$", "1"*n))
num = int(input("Number to be checked: \n"))
print (num, "is" + " not" * (not is_prime(num)) +" a prime")3. By Brofar
Made by Brofar. Python Program to check if a number is prime or not. Source
This is the number you entered 4
4 is not prime
False
1 * 4
2 * 2
4 * 1
Neither number is emirp or a palindromic prime
import datetime
import time
a=int(input())
b = a
r = str(a)
s = r[::-1]
a = int(s)
print(f"This is the number you entered {r}\n")
if ((b%2) == 0):
print(r + " is even")
else:
print(r + " is odd")
m=int(b**(1/2))+1
for i in range(2,m):
if b % i == 0:
print(b, 'is not prime')
p1 = False
print(p1)
break
else:
print(b, 'is prime')
p1 = True
print(p1)
for i in range(1,30000):
if b%i==0:
print(' ',i,' * ', b//i)
print()
if ((a%2) == 0):
print(s + " is even")
else:
print(s + " is odd")
n=int(a**(1/2))+1
for i in range(2,n):
if a % i == 0:
print(a, 'is not prime')
p2 = False
print(p2)
break
else:
print(a, 'is prime ')
p2 = True
print(p2)
for i in range(1,30000):
if a%i==0:
print(' ',i,' * ', a//i)
if ((p1 == True) and (p2 == True) and (a > 10 ) and (b > 10)):
print(f"\n\n{b} is prime, an emirp number and a palindromic prime")
else:
print("\n\nNeither number is emirp or a palindromic prime")4. By Goodmen
Made by Goodmen. The program checks if a number is prime or composite. Source
n = 3 V 3 = 1.7320508075688772 limit = 1 It's prime number
import math
n = int(input())
if n < 2:
print("A number must be more 1")
quit()
elif n == 2:
print("It's prime number")
quit()
i = 2
print ("n = ",n)
limit = int(math.sqrt(n))
print ("V",n," = ",math.sqrt(n))
print ("limit = ",limit)
while i <= limit:
print ("i =",i)
print ("ost n / i =", n%i)
if n % i == 0:
print("It's composite number")
quit()
i += 1
print("It's prime number")5. By Chandini
Made by Chandini. Basic Prime Checker Program. Source
2 Given number is a prime number
n=int(input())
i=1;count=0
while(i<=n):
if(n%i==0):
count+=1
i+=1
else:
i+=1
if(count==2):
print("Given number is a prime number")
else:
print("Given number is not a prime number")6. By ishwar
Made by ishwar. Source
54 54 is not a prime number
x,i = int(input()),2
if x==1 :
print(x," is a neither prime number nor a composite number")
if x<0:
print("sorry! there are no negative prime numbers exist")
while (x%i!=0 and x!=1 and x>=0 and x!=0) or x%i==0:
if x==i and x%i==0 or x==(-i):
print(x,"is a prime number")
elif x%i==0 :
print(x,"is not a prime number")
if i==x or x%i==0:
break
i+=17. By Deepanshu Gupta
Made by Deepanshu Gupta. Python program that checks and outputs all the prime numbers in a given range. Source
Prime numbers between 1 and 10 are: 2 3 5 7
lower = 1
upper = 10
print("Prime numbers between", lower, "and", upper, "are:")
for num in range(lower, upper + 1):
# all prime numbers are greater than 1
if num > 1:
for i in range(2, num):
if (num % i) == 0:
break
else:
print(num)8. By Alexander Gromozonov
Made by Alexander Gromozonov. Source
Enter your natural number:3 This is a prime number.
def isprime(n):
if n==1:
return 0
for i in range(2,int(n**0.5)+1):
if n%i==0:
return 0
return 1
while True:
try:
x=int(input("Enter your natural number: "))
except ValueError:
print("This is not a number! Try again.")
continue
if x>0: break
else: print("Your number isn't natural! Try again.")
if isprime(x):
print("This is a prime number.")
else:
print("This is a composite number.")9. By Divyanshu Singh
Made by Divyanshu Singh. A basic python program to check if the input number is prime number. Source
Enter number: 35 35 is not a prime number. 5 times 7 is 35
num=int(input("Enter number: "))
print(num)
print()
if num > 1:
for i in range(2, num):
if (num%i) == 0:
print(num, "is not a prime number.")
print(i, "times", num//i, "is", num)
break
else:
print(num, "is a prime number.")
else:
print(num, "is not a prime number.")10. By misgav yosef
Made by misgav yosef. Source
your number is: 44 not prime
j=int(input("your number is: "))
list=[]
for i in range(j):
list.append(i)
list.remove(list[0])
list.remove(list[0])
if all ([j%x!=0 for x in list]):
print("{}\nprime".format(str(j)))
else:
print("{}\nnot prime".format(str(j)))11. By Stamen
Made by Stamen. Simple Prime Number Checker Program. Source
Type a number to check if it's prime: 22 2 times 11 is 22 22 is not a prime number.
from math import sqrt
try:
num = int(input("Type a number to check if it's prime: \n"))
x = 2
y = "is a prime number."
if num == 1:
print(num, "is not a prime number.")
exit(0)
while x <= sqrt(num):
if num % x == 0:
y = "is not a prime number."
print(x, "times", num//x, "is", num)
x += 1
print(num, y)
except ValueError:
print("That isn't a number!")