Prime Number Checker

using System;

class PrimeNumberChecker
{
    static void Main()
    {
        Console.Title = "Prime Number Checker";

        Console.WriteLine("Please enter a positive integer in the range [1, 100] to\n" +
                            "check if it is prime or not:");

    Prompt:
        string inputString = Console.ReadLine();
        byte input;

        if (byte.TryParse(inputString, out input) && input <= 100 && input >= 1)
        {
            if ((input > 10 && input % 2 != 0 && input % 3 != 0 && input % 5 != 0 && input % 7 != 0) || (input == 2 || input == 3 || input == 5 || input == 7))
            // If the input is greater than 10 and not divisible by any of the prime numbers in the range [1, sqrt(100)], i.e. {2, 3, 5, 7} then it is prime.
            // The only prime numbers less than 10 are 2, 3, 5 and 7.
            {
                Console.WriteLine("{0} is prime.", input);
                goto Prompt;
            }
            else if (input == 1)
            {
                Console.WriteLine("1 is neither prime nor composite.");
                goto Prompt;
            }
            else
            {
                Console.WriteLine("{0} is composite.", input);
                goto Prompt;
            }
        }
        else
        {
            Console.WriteLine("Invalid input. Please enter a positive integer in the\n" +
                                "range [1, 100]:");
            Console.WriteLine();
            goto Prompt;
        }
    }
}