Fifteen. 15 x 15 = 225
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225 is a square number because 15 times 15 = 225
225 is a square number.
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
The square root of 225 is 15, which is a rational number.
15 x 15 = 225 225 x 225 = 50625