8 and 16
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28 and 32
Two composite numbers that have 8 as a factor are 16 and 24. Both numbers can be divided by 8 without leaving a remainder, and they each have additional factors beyond 1 and themselves, qualifying them as composite numbers.
Two is prime. All other even numbers are composite.
Composite numbers have more than two factors. Once you find a third factor, you know your number is composite.
Only two: (4, 9) and (6, 6). In all other factor pairs, one of the numbers is not composite.