using System;

​

public class Program

{

    //Q13. Write a C# program to check if a number input by the user is prime or not

    //Test Data :

    //Enter a number : 7

    //Expected Output : 7 is prime

    public static void Main()

    {

        int count = 0;

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

        int n = Convert.ToInt32(Console.ReadLine());

        for (int i = 1; i <= n; i++)

        {

            if (n % i == 0)

            {

                count++;

            }

        }

​

        if (count == 2)

        {

            Console.WriteLine(n + " is prime");

        }

    }

}