Problem 8. Prime Number Check

using System;

class PrimeNumberCheck
    {
        static void Main()
        {
            int inputNumber = int.Parse(Console.ReadLine());
            if (inputNumber == 1)
            {
                Console.WriteLine("false");
            }
            else if (inputNumber == 2 || inputNumber == 3)
            {
                Console.WriteLine("true");
            }
            else
            {
                Console.WriteLine(inputNumber%2 == 1 && inputNumber%3 == 1 ? "true" : "false");
            }
        }
    }