Square roots can be positive or negative.
9 x 9 = 81
-9 x -9 = 81
9 is the positive square root of 81.
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Yes.
There are two of them. One is positive 0.25 . The other is negative 0.25 .
The square (not sqare) root is approx 23031.054
The square root of 9/16 is 3/4 which is a rational number
22.627416997969520780827019587355