PrimeCheckers

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

namespace _2.PrimeCheckers
{
    class PrimeCheckers
    {
        static void Main()
        {
            long n = long.Parse(Console.ReadLine());
            PrimeChecker(n);
        }
         public static void PrimeChecker(long n)
        {
            bool isPrime = true;
            long divider = 2;
            long nSqrt = (long)Math.Sqrt(n);
            while (isPrime == true && (divider <= nSqrt))
            {
                if (n % divider == 0)
                {
                    isPrime = false;
                }
                else
                {
                    divider++;
                }
            }
            Console.WriteLine("{0} - {1}", n, isPrime);
        }
    }
}