Any number multiplied by 247.
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247, 494 (=247*2), 741 (=247*3) etc.
It is divisible by three which gives you 247
No.
Yes, but not evenly. The answer is 27 4/9 or 27.44444444444. An easy way to know if the number is evenly divisible by 9 is to sum the digits - if the sum is divisible by 9, so is your number. In this case 2 + 4 + 7 = 13 which is not divisible by 9.
247 is not prime. 247 = 13 * 19