Yes.
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489 is a composite number that is divisible by 3.
No, not to a whole number (489/5 = 97.8)
489 divided by 3 equals 163.
486
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.