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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 since 172 or 17 * 17 = 289
square root of 9 = 3 but 2, 17 and 23 are irrational numbers
The square root of 17 is not a rational number so it can only be approximated in fraction form. Sqrt(17) = 4.1231 (approx) = 41231/10000 which is a fraction in its simplest form.
The square root of 289 is 17