Snippet

    def check_number(num: int) -> str:
        """Returns prime status of the number."""
        if is_prime(num=num):
            return str(num) + " is a prime number"
        else:
            return str(num) + " is not a prime number"

    def is_prime(num: int) -> bool:
        """Checks whether or not a number is prime."""
        if num <= 1:
            return False
        divisor = 2
        while divisor <= num // 2:
            if num % divisor == 0:
                return False
            divisor += 1
        return True

    def main() -> None:
        """Main entrypoint into the program."""
        print(check_number(num=13))

    main()

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