using System;

public class Program

{

    public static void Main()

    {

        int number = 5;

        bool isprime = true;

        for(int i=2;i<number/2;i++)

        {

            if(number%i==0)

            {

                isprime=false;

                break;

                Console.WriteLine("{0} is not a prime number",number);

            }

        }

        if(isprime)

        {

            Console.WriteLine("Num is prime.");

        }

        else

        {

            Console.WriteLine("Num is not prime.");

        }

​

    }

}