2 and 3 for product,
5 and 13 or 7 and 11 for sum
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18 is not a prime number so no number can have 18 as a prime factor.
The only two prime factors of 18 are: 2, 3
The prime factorization for 18 is: 2 x 9 2 x 3 x 3, so the two prime numbers that give you 18 are 2 and 3.
There are only two and they are 3 and 2.
The multiples of 9 are numbers that can be divided evenly by 9. The two prime numbers closest to a multiple of 9 are 7 and 11. Since 9 is between 7 and 11, the multiple of 9 that is in between these two prime numbers is 9 itself.