No.
As 9 is smaller than 45 it cannot be divisible by 45.
However, 9 is a FACTOR of 45; and 45 is divisible by 9.
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45 yes, 812 no.
It is: 45
no yes 9 goes into 45 5 times
Just add up the digits and if that sum is divisible by 9 then the original number is divisible by 9. Example 729 = 7+2+9 = 18 (18 is divisible by 9 therefore 729 is divisible by 9) 123456789 = 1+2+3+4+5+6+7+8+9 = 45 (45 is divisible by 9 therefore 123456789 is divisible by 9)
It is: 45