9 = IX in Roman times
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It is a square number because 9 times 9 equals 81
if x is an unkown number, there is no answer. It's an expression. If you mean -3 times -9, the answer is -27.
Cubing a number does not mean multiplying it by 3 - it means multiplying it by itself, and then multiplying it by itself again. For example, 9 cubed is equal to 9 x 9 x 9 = 729.
The number is: 9*9*9 = 729
27 times the number.