yes, because 861 divided by 3 is 287
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No.
861 is divisible evenly by 3 but none of the others
1, 3, 7, 9, 21, 41, 63, 123, 287, 369, 861, 2583.
It is divisible by three which gives you 247
77922 is divisible by 6. 77922 / 6 = 12987 To check if a number is divisible by 6, the number has to be even and divisible by three. An easy way to check if a number is divisible by three is to see if the sum of the digits is divisible by three. 77922 7+7+9+2+2 =27 27 2+7 =9 9 is divisible by three, so 77922 is divisible by three also.