3, 5, 9, 15, 25, 27, and 45 are some examples
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Prime squares have three factors. 4, 9, 25
4, 9, 25 and 49 They are squares of prime numbers.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.
Prime numbers like 2, 3, 5 and 7
Prime factors of 18 are 2 and 3 Prime factors of 45 are 3 and 5