The square of 17 is 289.
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The square root of 289 is 17 since 172 or 17 * 17 = 289
It is: 17 times 17 = 289
An "imaginary" number. Those number are called imaginary for historical reasons, but they have very "real" practical applications. The result is written as root(17)i (replace root(17) with the square root symbol).
The square root of 289 is 17
square root of 9 = 3 but 2, 17 and 23 are irrational numbers