03. Sum Prime Non Prime

import java.util.Scanner;

public class SumPrimeNonPrime {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        int sumPrime = 0;
        int sumNotprime = 0;
        while (!input.equals("stop")) {
            int numberInput = Integer.parseInt(input);
            if (numberInput < 0) {
                System.out.println("Number is negative.");
                input = scanner.nextLine();
                continue;
            }

            int counter =0;
            for (int i = 1; i <=numberInput ; i++) {
                if (numberInput%i==0){
                    counter++;
                }
            }
            if (counter>2){
                sumNotprime +=numberInput;
            }else{
                sumPrime +=numberInput;
            }
           input = scanner.nextLine();
        }
        System.out.println("Sum of all prime numbers is: " + sumPrime);
        System.out.println("Sum of all non prime numbers is: " + sumNotprime);
    }
}