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90
When a number is squared, it means that it is that number is multiplied by itself. So in this case it would be 9x9 which is equal to 81.
Your square footage is the length and width or 9x9 or 81sq ft. For cubic you need to include another measurement, that would be the depth. For instance if you want the depth to be 9ft also then your cubic measurement would be 9x9x9 or 729 cu ft.
A 9x9 foot slab 4 inches thick requires a minimum of 1 cubic yard. If you go to 6 inches thick you will need 1.5 cubic yards.
The square footage is 81 sq ft (9 x 9). Note, if you are buying flooring materials, you will need to get more - probably at least 10% waste which will bring you to around 90 sq ft. (it could be more for carpet since you need to order in 12 ft rolls - prob 111sf needed)