SumPrimeNonPrime

import java.util.Scanner;

public class SumPrimeNonPrime {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String command = scanner.nextLine();
        Integer sumPrime = 0;
        Integer sumNonPrime = 0;

        while(!"stop".equals(command)){
            Integer number = Integer.parseInt(command);
            Integer counter = 0;
            if(number < 0){
                System.out.println("Number is negative.");
            }else{
                for(int i = 1; i <= number; i++){
                    if(number % i == 0){
                        counter += 1;
                    }
                }
                if(counter == 2){
                    sumPrime += number;
                }else{
                    sumNonPrime += number;
                }
            }
            command = scanner.nextLine();
        }
        System.out.printf("Sum of all prime numbers is: %d\n", sumPrime);
        System.out.printf("Sum of all non prime numbers is: %d", sumNonPrime);
    }
}