3 could be a prime factor but it depends on which number you're trying to find the prime factors of.
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9 is not a prime factor, but it does have one prime factor, which is three. Prime factors are factors of a number that are prime.
It depends how its used. 3 is a prime number. 3 is a prime factor of 12.
The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.
27 has only one prime factor: 3
The smallest prime factor of 1,365 is 3.