No, it is not.
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To test whether a number is divisible by 3, the sum of its digits must also be divisible by 3. In this instance, the sum of the digits of 8264 is equal to 20. Therefore, since 20 is not divisible by 3, nor is 8264.
no
Yes
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.