No, 250/3 = 83 remainder 1
3 is not a factor of 250 : the prime factors are 2 x 5 x 5 x 5 (2 x 53).
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3 is not divisible by 126. 126 is divisible by 3.
3 is not divisible by 72. 72 is divisible by 3.
512 is not divisible by 3.
Multiples of 9 and 6 are also divisible by three, the reverse is not true. 15 is divisible by 3, but not 6 or 9. 27 is divisible by 3 and 9, but not 6. 12 is divisible by 3 and 6, but not 9. 54 is divisible by 3, 6 and 9.
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