Divisibility: if a and b are whole numbers with a not = to 0, then a is a factor of b if and only if there is a whole number c such that a * c = b, we can say "a divides b" or "b is a multiply of a".
To find out if a large number is divisible by 2 without using a calculator, you can add up the sum of all of the digits, and if that number is divisible by 2, then the number as a whole is divisible by 2.
Example: 24,593
2+4+5+9+3 = 23
23 is not evenly divisible by 2...
therefore, 24,593 can not be evenly divided by 2.
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