No 28 is a composite number
and not a multiple of 3
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88 is a composite number because it is an even number. All numbers greater than 8 and less than 100 are composites if they are even numbers, if they are multiples of 3 or 7, or if they end in 5 or 0.
2, 4, 6 All even numbers have even multiples.
The numbers 3,6 and 9 are all multiples of 3 because 3 can go into all of them evenly.
To any set that contains it! It belongs to {14}, or {14, sqrt(2), pi, -3/7}, or all whole numbers between 3 and 53, or multiples of 7, or composite numbers, or counting numbers, or integers, or rational numbers, or real numbers, etc.