No.
A very quick way to know whether or not a number is divisible by is adding up the numbers within the number. And see if the new number is divisible by 3.
For instance, the number 527, add 5, 2, and 7 together. (5+2+7=14) The answer, 14, is not divisible by 3.
Another example would be the number 168. 1+6+8=15 The number 15 is divisible by 3, therefore the number 168 is divisible by 3.
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3
No. 527 is divisible by 1, 17, 31, 527.
Its factors are: 1, 17, 31 and 527
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 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.