Greta said that the product of two prime numbers must also be a prime number. Joan disagreed. Who is correct?

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  1. Try multiplying some of these prime numbers.

    What do you think?

  2. By definition, the product of two numbers other than 1 cannot be a prime. And, since 1 is not a prime number, the product will have two factors, so it cannot be prime!

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  3. This really helped me.

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  4. This really helped me. Thank you.

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