I’m a little bit confused about something. So the number 1 is not a prime number because it’s only divisible by 1 and the definition of a prime number is that it is divisible by 1 and itself. But is 1 considered a prime factor? So for example, if the question is the number of distinct prime factors of 27, do I include 1 and 3 or just 3?

A prime factor needs to be prime. Since 1 is not a prime, it is not a prime factor either. So only 3.

Hey… tlakiss

1 is not prime number because it multiple with every number like with 1 to be a number in the same way that 2,3,4 and so on are numbers.

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