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It is neither because the square root of -18 is an imaginary number but the square root of 18 is irrational

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Q: Is the square root of negative 18 rational or irrational?
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Are negative square roots rational or irrational?

If the positive square root (for example, square root of 2) is irrational, then the corresponding negative square root (for example, minus square root of 2) is also irrational.


Is the negative square root of 17 irrational or rational?

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Is the square root of x and the square root of NEGATIVE x both rational and irrational?

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Is the square root of -81 rational or irrational?

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