97 is prime. Prime numbers don't have proper factors.
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No, no prime number has proper factors.
The set of factors includes one and the number itself. Proper factors do not include those two.
In the context of primes and factoriation, every counting number is a factor.
No, prime numbers do not have proper factors.
Proper factors occur when you list all the factors of a number except for 1 and the number itself. Common factors occur when you compare a minimum of two sets of factors and see which ones they share.