How to get prime number generator to also output excluded nonprimes?

[Ying Yang]

The code I created prints prime numbers but i also need to print their multiples that I previously excluded from being generated. Sorry if that's confusing but...I have the code worked out so that all the prime numbers generate as followed:
2:
3:
5:
etc.
However, I have absolutely no idea how to get it to print the numbers (the multiples of the prime numbers printed) excluded after it so that it looks like:
2: 4 6 8 10
3: 9 15
etc

Scanner keyboard = new Scanner(System.in);
//variables
int size;
int [] numberArray;
int [] out;
 
//user input upperbound
System.out.println("Enter the size of the array from 2 to 100:");
size = keyboard.nextInt();
//array
numberArray = new int[size];
 
//Fill the array.
for (int i=1; i<size; i++)
{
numberArray[i]=i;
}
 
 
numberArray[1] = -1;
//Identify 2 as the first prime number and then remove all numbers that are evenly divisible by 2
//start the for loop with 2
for (int i=2; i<size; i++){
//if the number has not already been discluded
if(numberArray[i] != -1){
for(int j = 0; j < size; j++ ){
// if the number is a multiple of a prime
if(numberArray[j]%numberArray[i] == 0 && numberArray[j] != numberArray[i] ){
//exclude it
numberArray[j] = -1;
 
}
}
}
}
 
//print prime number
for(int i = 1; i < size; i ++){
if(numberArray[i] != -1)
System.out.println(numberArray[i] + ":");
 
}
 
 
System.out.println();
 
 
}

[Dheeraj Joshi]

2:0 4 6 8 
3:9 
5:
7:
 

Is this is what you expect for numbers between 0-9?

I added one print statement

for (int i=2; i<size; i++){
         if(numberArray[i] != -1){
             System.out.print(numberArray[i] + ":");
         for(int j = 0; j < size; j++ ){
             if(numberArray[j]%numberArray[i] == 0 && numberArray[j] != numberArray[i] ){
                     System.out.print(numberArray[j] + " ");
                         numberArray[j] = -1;
                 }
             }
             System.out.println();
         }
}
 

Try this.

Regards
Dheeraj Joshi