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31 is prime. 32 and 33 are composite.
If you mean 45 then it is a composite number because it has more than two factors
Every positive integer greater than 1 is either prime or composite.
If a positive integer has only two factors, it's prime. If it has more than two, it's composite.
723 is composite. Its positive integer factors are: 1, 3, 241, 723