num = int(input("Enter a Number."))

def is_prime(number):
    if number <= 1:
        return False
    for i in range(2, int(number**0.5) + 1):
        if number % i == 0:
            return False
    return True

if is_prime(num):
    print( num, "is a prime number.")

else:
    print( num, "is not a prime number.")