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There is no real number [square] root of a negative number. There is a real cube root and a real fiftth root etc, but root, by itself, implies square root.
The square root of any positive real number (as in this case) is a real number. (Such square roots are usually irrational.)The square root of a negative real number, such as the square root of -15, is an imaginary, and therefore also a complex, number.
Of course, not only can it be a real number but it is a real number. When you take the square root times itself, the result is a number that is real.
No. In general, the square root of a negative number is an imaginary number, which is not a real number.
The square root of a negative number is not real.