8 yes, 9 no.
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It's divisible by both (240 times for 9, 270 times for 8)
Using the tests for divisibility:Divisible by 3:Add the digits and if the sum is divisible by 3, so is the original number: 6 + 8 + 4 = 18 which is divisible by 3, so 684 is divisible by 3Divisible by 6:Number is divisible by 2 and 3: Divisible by 2:If the number is even (last digit divisible by 2), then the whole number is divisible by 2. 684 is even so 684 is divisible by 2.Divisible by 3:Already shown above to be divisible by 3. 684 is divisible by both 2 & 3 so 684 is divisible by 6Divisible by 9:Add the digits and if the sum is divisible by 9, so is the original number: 6 + 8 + 4 = 18 which is divisible by 9, so 684 is divisible by 9Thus 684 is divisible by all 3, 6 & 9.
The number 2,340 can be divided by the number 9 260 times.
Every number is divisible by any non-zero number. Furthermore, 4770 is evenly divisible by both 3 and 9.
Every number is divisible by any non-zero number. Furthermore, 405 is evenly divisible by both 3 and 9.