using System;

​

public class Program

{

public static void Main(string[] args)

​

{

​

int n,i; 

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

​

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

    for(i=2;i<n;i++)

​

{

​

if((n%i)==0)

​

break;

} 

if(i==n)

    Console.Write(n + "is prime number");

​

else

​

Console.Write(n + "not a prime number");

} 

​