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Yes. The only known almost perfect numbers are the powers of 2. 32 = 2^5 is an almost perfect number. It has not yet been proved whether {x: x = 2^n for n in N} = {x: x is an almost perfect number}.
Yes, nine is a perfect squarebecause 9 = 3*3
Because 9*9 = 81 which is a square number or a perfect square.
A whole number that can be made by multiplying an integer by itself is a perfect square, or square number. An example is 81, which is a perfect square made by 9 x 9.
Because 9 is a perfect square - which means that its square root is an integer. 3 is not a perfect square.