Lab4 - Calculate sum of prime numbers from 1 to N, (create boolean function?)

void setup(){
  sum_prime_number(10);
}

void sum_prime_number(int numbers_end){
 int numbers=2;
 int sum=0;
 int n=1;
 print("Prime number is ");
 while(numbers<=numbers_end){
  int reference=2;
  boolean prime_numbers=true;
   while(reference<numbers && prime_numbers){
    if(numbers%reference==0) prime_numbers=false;
    reference=reference+1;
   }
   if(prime_numbers){
    sum=sum+numbers;
    print(numbers+",");
    n=n+1;
   }
   numbers=numbers+1;
 }
 println("");
 println("Sum of prime number is "+sum);
}