Write a program in Python to check if a number is prime.

def is_prime(num):

    if num <= 1:

        return False

    for i in range(2, int(num**0.5) + 1):

        if num % i == 0:

            return False

    return True

num = 17  # Replace with your number

if is_prime(num):

    print(f"{num} is prime.")

else:

    print(f"{num} is not prime.")