No, but it is irrational, because there is no rational number whose square is two. Imaginary numbers are the square roots of negative numbers.
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√(-2) = √(-1) * √(2) = i√(2) ( i being the imaginary root [or √(-1)] )
The square root of -64 is 8i. ' i ' is the unit imaginary number, equal to the square root of -1, or 1 at an angle of pi/2.
2
-1 -i and -1 + i, where i is the imaginary square root of -1.
it is 3i and imaginary where i = square root of -1