Since the digits of 210 add up to 3, and that is divisible by 3 then 210 is divisible by 3. This works for 3, 9, and 27.
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3 is not divisible by 630. 630 is divisible by 3.
None, if a number is divisible by 210 then it is not a prime number!
No - 210/4 = 52.5
210
105, 210, 315 and so on.