2, 3, 6, 9
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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.
The factors of 18 are: 1 2 3 6 9 18 The prime factors are: 2 x 3 x 3
97 is prime. Prime numbers don't have proper factors.