Because 9*9 = 81 which is a square number or a perfect square.
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Yes the word how can be an adverb. For example, "How did you solve the sudoku puzzle? Other times it can be a conjunction: "He forgot how the switches had been set."
No, 325 is not a perfect square however 324 is a perfect square.
38 is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer.
No- the closest perfect squares are 36 (perfect square of 6) and 49 (perfect square of 7)