Oh, dude, you're really making me use my math brain here. Okay, so composite numbers are like those popular kids at school who hang out with more than just the number 1 and themselves. So, if we're looking for numbers that have 8 as a factor, we can pick 16 and 24. Those numbers are like the cool kids who let 8 join their squad without any drama.
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If you can arrange the counters in the shape of a rectangle with at least two in each row and each column then the number is composite. The numbers of row and the numbers of columns are factors of the given number. If the only rectangle you can make is the "degenerate" one, with only one row or only one column, then the number is prime.
13 and 19 are prime. 33 and 45 are composite.
The squares can have sides equal to each factor that is common to both numbers.
There are four of each.
33 has the factors ,3, & '11' ; it is composite 43 has no factors ; it is a prime number 63 has the factors 3,7,9,21 ; it is composite.