2, 3, 5, 7 because all of them can only be multiplied by two numbers (1 and themselves) to equal them
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2, 3, 5 are prime numbers but 9 is not a prime number
7 is a prime number but 9 is a composite number
9 is not a prime. 73 is a prime.
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.
Prime numbers from 1 to 9 are: 2 3 5 and 7