They are the product of a number by itself. That's what square means. And "composite" means that a number is made up of more than one factor.
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28, like all even numbers greater than 2, is a composite number.
All square numbers greater than 1 are composite.
No. Prime numbers cannot be composite and composite numbers cannot be prime!
All even numbers greater than 2 are composite.
442 is composite. All even numbers greater than 2 are composite numbers.