java prime or not

import java.util.Scanner;
public class ls {
    public static void main(String[]args){
        Scanner kb = new Scanner(System.in);

        int num1;
        System.out.print("enter a number : ");
        num1 = kb.nextInt();

        if(num1%2==0){
            System.out.print("the number is not a prime number\n");

        }
        else if(num1%3==0){
            System.out.print(" number is not a prime number\n");

        }
        else {
            System.out.print("the number is a prime number\n");
        }
    }
}