It belongs to the set of prime numbers because it has only two factors which are itself and one.
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13 because it is a 2-digit number? or because the third # in the set of odds (1,3,5,7,9...) would be 11, not 13... ~Im a secret
Technically, these kinds of questions are invalid, since all of the above elements share several properties and therefore "belong" for at least one reason. It should be noted that 13 is the only prime number in this particular set.
The set of negative integers
Its an imperial numberIts belong to rational, whole, and integars.