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Python program to check prime number or not

 Given an integer,Write a python program to check if an integer is a prime number or not.

Prime Number

A given a number is said to be prime if the number has exactly two factor which is 1 and itself or the number is said to be prime  if the number is divided by 1 and itself.

example -2 = factor of 2 is 1 and 2 so it is a prime because it has exactly two factor

Example:

1. 2 -prime

2. 1 - Not a prime

3. 3 -Prime

Python Program

def prime(n):
    #To count the factor of a number
    count = 0
    #we check from 2 because 1 is not a prime number
    if n > 1:
        for i in range(1,n+1):
            if n%i==0:
                count+=1
    else:
        return "Not a prime"
    #If the number has exactly 2 factor then we return as a prime number
    if count==2:
        return "Prime"
    else:
        return "Not a prime"
#Taking user input
n = int(input())
#calling the prime number function
print(prime(n))

Input:

2

Output:

Prime

Input:

1

Output:

Not a prime

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