It is unlikely that you have a built in shortcut key.
However, if you are using Microsoft Word you can set up a custom hotkey. A square root sign has character code 221A - you can find it under Insert: Symbol. From there you can set a keyboard shortcut; I've just set mine to Ctrl + SQ, which works fine.
The standard shortcut key is "ALT"+ X
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It is 221A + Alt X
It is a keyboard, not a keybored ! There is no square root button on a standard keyboard, but if you are bored, you can find out how to program a key and get one of the keys to be your square root key.
press alt and then v (at least it worked on mine)
Nothing!