In the context of primes and factoriation, every counting number is a factor.
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The set of factors includes one and the number itself. Proper factors do not include those two.
No, prime numbers do not have proper factors.
Every number has one as a factor because one can divide into any number with no remainder. Every number does not have one as a proper factor because the set of proper factors does not contain one and the number itself.
No, no prime number has proper factors.
The factors of 17 are itself and one because 17 is a prime number