Yes.
To check if divisible by 3 sum the digits of the number, and if this sum is divisible by 3, so is the original number: 1 + 6 + 5 + 6 = 18 which is divisible by 3, so 1656 is divisible by 3.
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The multiples of 184 (which are infinite) are all divisible by 184, including these: 184, 368, 552, 736, 920, 1104, 1288, 1472, 1656 . . .
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.
Not evenly. A number is divisible by 3 if the sum of its digits is divisible by 3.
416 is divisible by 2 but is not divisible by 3.