You can add up the digits, 6+4+2=12 and if that number is divisible by three, so it the original number. So 12 is certainly divisible by 3 so that means 642 is also.
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No. 642 is not evenly divisible by nine.
Yes and it is 107
5
Yes, evenly
693 is evenly divisible by 3. You can tell that at a glance because every one of its digits is evenly divisible by 3.