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no take 3 for example. 3 6 9 3 x 3= 9 so that's composite.

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Q: Are all the multiples of prime numbers prime numbers?
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Are all the multiples of 3 prime numbers?

no


What are three multiples of six in prime numbers?

Multiples of 6 cannot, by definition, be prime numbers!


What is the difference between prime numbers and multiples?

Multiples aren't prime.


What are all the numbers that are not prime numbers called?

They are the composite numbers, products of primes and their multiples. All even numbers are composite, except the number two (2) which is prime.


Why odd numbers have lots of prime numbers?

The only even prime is 2. The rest are all multiples of 2, and thus cannot be prime.