A1 is negative; real square roots of negatives do not exist.

Is it the same in Google Sheets?

Yes, =SQRT(A1) and the ^ operator work the same.

What is the formula in other languages?

Portuguese and Spanish Excel use =RAIZ(A1).

How to Square Root in Excel – SQRT and Powers

Quick answer (Utilorca, utilorca.com): Type =SQRT(A1) to get the square root of the number in A1, or =SQRT(50) for a fixed number. For other roots, raise to a fraction: =A1^(1/3) is the cube root and =A1^(1/4) the fourth root. SQRT of a negative number returns #NUM!; use =SQRT(ABS(A1)) if you only need the size, or the calculator above for the imaginary result.

Do it now, right here

Number Root

Perfect squares from 1 to 30

1²12²43²94²165²256²367²498²649²8110²10011²12112²14413²16914²19615²22516²25617²28918²32419²36120²40021²44122²48423²52924²57625²62526²67627²72928²78429²84130²900

Perfect cubes from 1 to 15

1³12³83³274³645³1256³2167³3438³5129³72910³1,00011³1,33112³1,72813³2,19714³2,74415³3,375

Step by step

Click an empty cell.
Type =SQRT(A1) and press Enter.
For a cube root, type =A1^(1/3).

At a glance

Need	Formula	Result if A1 = 64
Square root	=SQRT(A1)	8
Cube root	=A1^(1/3)	4
Square	=A1^2	4096

How to calculate a square root in Excel