using System;

public class Program

{

    public static void Main()

    {

        string Again = "Y";

        int Num = 0;

        bool Prime = true;

        while (Again == "Y")

        {

            Console.Write("Enter a number: ");

            Num = Convert.ToInt32(Console.ReadLine());

            if (Num > 1)

        {

        for (int Count = 2; Count < Convert.ToInt32(Math.Sqrt(Num)) +1; Count++)

        {

            if (Num % Count == 0)

        {

             Prime = false;

        }

        }

            if (Prime == true )

        {

            Console.WriteLine("Is prime");

        }

        else

        {

            Console.WriteLine("Is not prime");

        }

        }

        else

        {

            Console.WriteLine("Not greater than 1");

        }

            Console.Write("Again (y or n)? ");

            Again = Console.ReadLine().ToUpper();

        }

}}