8i and -8i both satisfy this: (8i)² = (8²)(i²) = (64)(-1) = -64, and
(-8i)² = (-8²)(i²) = (64)(-1) = -64
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No, but √-23 is. An imaginary number is the square root of a negative number.
They are imaginary.
Yes it is an imaginary number
A negative square root is an imaginary number.
only if its an imaginary number