There is no such thing as "squar routage" as appeared in the question.
The square root of a number is a number, which, when multiplied by itself gives the required number. Furthermore, if x is a square root of y then -x is also a square root of y.
Thus the square roots of 9 are -3 and +3.
The square roots of 2.25 are -1.5 and +1.5.