calculate sum of prime/non-prime numbers

number_input = input()
prime_sum, non_prime_sum = 0, 0
if number_input != "stop":
    number_input = int(number_input)
    while number_input != "stop":
        counter = 0
        division = 0
        try:
            if number_input != 0 and number_input > 0:
                for n in range(2, number_input):
                    division = number_input/n
                    if division.is_integer():
                        counter += 1
                if counter > 0:
                    non_prime_sum += number_input
                else:
                    prime_sum += number_input
            elif number_input == 0:
                prime_sum = prime_sum
            else:
                print("Number is negative.")
                pass
            number_input = int(input())

        except ValueError:
            break
else:
    print(f'Sum of all prime numbers is: {prime_sum}')
    print(f'Sum of all non prime numbers is: {non_prime_sum}')
    quit()

print(f'Sum of all prime numbers is: {prime_sum}')
print(f'Sum of all non prime numbers is: {non_prime_sum}')