No it is not. If you want to get a square number you must multiply a number by its self.
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No it is not a square number but it is very close to the square number 121.
81 is a square number
It is an irrational number
To convert from square feet to square yards, divide the number of square feet by 9. Example, a 10' x 12' room contains 120 square feet. 120 divided by 9 = 13.33 square yards.
120 inches is a linear measurement, so there are zero square feet in 120 inches. For 120 inches2, however, as there are 144 square inches in one square foot (12 inches by 12 inches), there are 120/144 square feet in 120 square inches, or .833 ft2.