The prime factorization of 531 is:
32 x 59
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531 is composite
531 is not a prime number. Other than itself and one, it is also divisible by 3, 9, 59, and 177.
531 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
It is a factor of 132, not a prime factor.
9 is not a prime factor, but it does have one prime factor, which is three. Prime factors are factors of a number that are prime.