The only prime factor of 16 is two.
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wow. no its not a prime number , its even for a start meaning its not prime , and it has many factors , 1,2,4,8 ...
If it has no prime factors in common. The prime factors of 16 are all twos and the prime factors of 27 are all threes. 16/27 has to be in simplest form.
16 if the prime factors don't have to be distinct. 210 if they do.
Two prime factors
Prime numbers have two factors.