No
Just above it is 300, and as it is 13 more than 287 and 13
itself is not divisible by 3, then 287 is also not.
Or 285 = 95 x 3
and 288 = 96 x 3
so 287 is not divisible by 3
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288 144,2 72,2,2 36,2,2,2 18,2,2,2,2 9,2,2,2,2,2 3,3,2,2,2,2,2
2 is not divisible by 19008. 19008 is divisible by 2.
2 is not divisible by 870. 870 is divisible by 2.
3 is not divisible by 126. 126 is divisible by 3.
A number is divisible by 6 if it is divisible both by 2 and 3 1240 is even then is divisible by 2 1+2+4+0 = 7 which is not divisible by 3 then 1240 is not divisible by 3 Thus 1240 is not divisible by 6