What kind of number can be divided by 9? Is it a multiple of 3 and 5 at the same time? Is it a multiple of 15/

What kind of number can be divided by 9? Is it a multiple of 3 and 5 at the same time? Is it a multiple of 15/

The sum of the numbers in each digit is a multiple of 9. The number can be divided by 9. For example, 216 2 + 1 + 6 = 9. 9 is a multiple of 9, so 216 can be divided by 9
A multiple of 3 and 5 at the same time must be a multiple of 15