No, it is not, because real numbers include negative numbers. The square root of a negative number is an imaginary number
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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.
Sometimes.The square root of a positive number is positive.The square root of zero is zero.The square root of a negative number is a complex number - if you want only real numbers, you can say that it is undefined, and many calculators will give you an error message.
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.