Try to divide it! If you get a whole number, then it is divisible; otherwise it isn't.
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18 is divisible by 1, 2, 3, 6, 9, and 18.
All multiples of 6 are evenly divisible by 6, such as: 6, -6, 12, -12, 18, -18, and so on. Numbers divisible by six must also be divisible by both 2 and 3.
Both. 18 / 6 = 3 and 18 / 9 = 2
Yes it is divisible by 2, 3, 6, and 9
Since the sum, 18, of the digits of 729 is divisible by 3, 18 = 3 x 6, then 729 is divisible by 3.