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9, 16 and 25 are all perfect squares.
The square root of an number, is the number that is times by itself to make the product. For example, the square root of 25 is 5 because 5 x 5 equals 25. Or the square root of 144 is 12 (12x12=144)
25 25 is not even and is a square. 3 is not even or a square.
12' x 25' = 300 square feet.
It is. Every number is a square number, though not necessarily a pefect square number. 12 is the square of sqrt(12) which is approx ±3.4641