06. Prime Checker

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

namespace _06.PrimeChecker
{
    class Program
    {
        static void Main(string[] args)
        {
            long a = long.Parse(Console.ReadLine());

            if (IsPrime(a))
            {
                Console.WriteLine("True");
            }

            else
            {
                Console.WriteLine("False");
            }
        }

        static bool IsPrime(long a)
        {
            if (a == 0 || a == 1)
            {
                return false;
            }

            for (int i = 2; i <= a/2; i++)
            {
                if(a%i==0)
                return false;
            }

            return true;
        }
    }
}