Multiples aren't prime.
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Multiples of 6 cannot, by definition, be prime numbers!
All prime numbers are odd numbers, except for the number 2. The difference between two odd numbers must be a multiple of 2. So, if the difference between two prime numbers is another prime number, that difference must be 2.Examples:{3, 5}{5, 7}{11, 13}{29, 31}
Multiples of 5 are not prime numbers except 5, so there are none. But, there are prime numbers between 20 and 40, like 23, 29, 31 and 37.
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.
The prime numbers between 13 and 28 are 13 17 19 23 Multiples of 7 in that range include 14, 21 and 28.