The square root of any negative number is not even a 'real' number. It's called 'imaginary',
because there's no number you can multiply by itself to get a negative number.
The square root of 101 is irrational.
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The square root of negative 64 isn't even a real number. In math and engineering, it's called an "imaginary number".
The negative square root of 16 is -4. It can be written as the ratio of 792 to -198, so it's rational.
The square root of 16 is 4 which is a rational number
The square root of any positive square number is always rational as for example the square root of 36 is 6 which is a rational number.
The square root of 100 is 10, and it is a rational number.