Technically, every positive number is a square in the real number system, but I assume you mean perfect square. And yes, 225 is a perfect square.
152 = 225
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225 is a square number.
The area is 225 square feet!
The square root of 225 is 15.
225 / 9 = 25 square yards
225 square kilometers equates to 2,421,879,750 square feet.