Yes, in so far as all numbers are squares (of some number). But it is not a perfect square.
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An 18 * 18 square has an area of 324 square units.
No, 18 is not a square number
18 m2 = 193.75 square feet.
18 square feet = 1.67 square meters.
18 square feet is about 1.7 (1.67225) square meters.