Hi Ramana,
Please use SQRT Function in calculated Measure column to achieve this.
SQRT ("Measure")
Please refer help.sap.com, this details are already available there.
https://help.sap.com/saphelp_hanaplatform/helpdata/en/20/e7de8875191014ba5dc4f74fa82376/content.htm
Best Regards,
Muthu