2 x 3 x 7 x 13 = 546
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2 is a prime number because its only factors are one and itself. Since 2 is a prime number, if it is a factor of your number, it is a prime factor.
155 is not a prime number, so it can't be a prime factor.
Nope.... 1 is a factor of every prime number !
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
Yes. Since 127 is a prime number it is also a prime factor.