It is impossible to write 90 as the product of two prime factors. 90 is equal to 2 x 32 x 5.
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There are no two prime numbers that equal 121. 121 is not a prime number itself, but is a product of 11*11.
When the two numbers are relatively prime.
7 and 67 are two prime numbers which have the product 469 when multiplied.
It is impossible for the product of two prime numbers to be prime. It is impossible for the sum of two prime numbers to be prime as long as one of the numbers isn't 2.
When the two numbers are relatively prime (their GCF is 1)