The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. If the set contains all of these factors, then the set is well defined because all elements are factors of 24, the common property of each element. 24 can be evenly divided by each number in the set and that is why it is well defined.
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Yes because they all have only 2 factors which are themselves and one
Well, there is a clear definition, and at least in theory you can always determine whether a number is a primer number or not, so I would say, yes.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. The set of prime factors is a subset of the set of factors for any given number.
All of the numbers from 1 to 100 are the factors in the set of numbers from 2 to 100.
Proper factors of a number do not include 1 or the number itself. For example, all of the factors of 6 are 1, 2, 3, and 6, but the proper factors of 6 are 2 and 3.