Pengecekan Bilangan Prima - V3

import java.util.Scanner;

public class Prima_V3 {
    public static void main(String[] args) {
        int r, bil, counter=0;
        Scanner sc = new Scanner(System.in);
        System.out.println("Masukkan sebuah bilangan asli: ");
        try {
            bil = sc.nextInt();
            for (r = 1; r<=bil;r++) {
                if (bil % r == 0) counter++;
            }
            if (counter == 2) System.out.println(bil+" adalah bilangan prima");
            else System.out.println(bil+" bukanlah bilangan prima");
        } catch (Exception e) {
            System.out.println("Kesalahan input !!");
        }
    }
}