It might be rational according to the technical definition of 'rational',
but it's imaginary.
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The square root of 16 is ±4 which is the rational number ±(4/1)
yes
No, it is a complex number.
The square root of 100 is rational since it is not repeating.
It is a rational number because it can be expressed as an improper fraction in the form of -80/1