no take 3 for example. 3 6 9 3 x 3= 9 so that's composite.
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no
Multiples of 6 cannot, by definition, be prime numbers!
Multiples aren't prime.
They are the composite numbers, products of primes and their multiples. All even numbers are composite, except the number two (2) which is prime.
The only even prime is 2. The rest are all multiples of 2, and thus cannot be prime.