Apart from 1, the rest are all composite. square numbers can be multiplied by at least 1, themselves and the number that they are multiplied to get that far (or more)!!
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Every square number (except 1) is composite. Prime numbers only have two factors, one and the numbers themselves. Since square numbers also have at least the square roots as factors, they have to be composite.
composite and square
The product of two prime numbers will be composite.
It is composite.
Products of prime numbers are composite numbers.