Factors are the numbers you multiple together to get another number.
15: 1, 3, 5, 15
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3, 5
No, no prime number has proper factors.
24 has eight factors, which means it has six proper factors.
The set of factors includes one and the number itself. Proper factors do not include those two.
Factors of 15 are: 1 3 5 and 15 of which 3 and 5 are prime factors