[Programming Fundamentals] - 23. Prime Checker

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _23_Prime_Checker
    {
    class PrimeChecker
        {
        static void Main(string[] args)
            {
            long num = long.Parse(Console.ReadLine());

            Console.WriteLine(IsPrime(num));

            } // End of Main

        public static bool IsPrime(long n)
            {
            bool checkPrime;

            if (n<2)
                {
                checkPrime = false;
                }
            else
                {
                checkPrime = true;
                for (long i = 2; i < n; i++)
                    {
                    if (n%i==0)
                        {
                        checkPrime = false;
                        break;
                        }
                    }
                }

            return checkPrime;
            }

        }
    }