import java.util.Scanner ;
class Problem19 {
    
	public static void main (String[] args) {
       
	   System.out.println("Please enter a number :");
        Scanner scanner = new Scanner (System.in);
        int n = scanner.nextInt ();
       
	   if (n % 1==0 && n % n==0) {
           
		   System.out.println(n + " is a prime number ");
        
        }
       
	   else {

            System.out.println(n + " is not a prime number ");

        }
        
    
	}
}