Yes, by 250. Here's a trick I use to find out whether a number is divisible by 3. If you add up all the digits of the numbers it may equal a multiple of 3, if it does it's divisible by 3. For example.
750: 7+5+0=12, which is divisible by 3.
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every even numbers divisible by 750 are the multiples of 750: 750, 1500, 2250,...
Yes, if x is an integer divisible by 3, then x^2 is also divisible by 3. This is because for any integer x, x^2 will also be divisible by 3 if x is divisible by 3. This can be proven using the property that the square of any integer divisible by 3 will also be divisible by 3.
-- All of the numbers that end with a zero are divisible by 10.-- All of those, and all of the numbers that end with a 5, are also divisible by 5.
All numbers divisible by 3 are NOT divisible by 9. As an example, 6, which is divisible by 3, is not divisible by 9. However, all numbers divisible by 9 are also divisible by 3 because 9 is divisible by 3.
Not evenly. A number is divisible by 3 if the sum of its digits is divisible by 3.