import static javax.swing.JOptionPane.*;
public class oppg4145{
	public static void main(String[]args){

		int tall = 1;
		while (tall != 0){
		  try {

			  String lesTall = showInputDialog("Les inn tall(avslutt med 0)");
			  tall = Integer.parseInt(lesTall);
			  System.out.println(isPrime(tall) ? lesTall + " " + "er primtall"  : lesTall + " " + "er ikke primtall");

		  }catch(NumberFormatException nfe){
			System.out.println("Vennligst les inn ett tall");
		  }

		}
	}

	public static boolean isPrime(int n){
	      if (n == 1)
	            return false;
	      if (n == 2)
	            return true;
	      if (n % 2 == 0)
	            return false;
	      for (int d = 3; d <= (int) Math.sqrt(n); d++){
	          if (n % d == 0)
	              return false;
		  }
	      return true;
    }
}