There is no single square root button on a keyboard. You can sometimes get the square root symbol by holding down alt and pressing 2 then 5 then 1 (or alt + 251). If that doesn't work, you could copy and paste it. √ (that square root sign is from pressing alt + 251)
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To type the square root symbol on ypur keyboard press and hold alt and type 251.
The square root symbol is like a tick with a line connected to the top. Go to http://en.wikipedia.org/wiki/Square_root and the square root symbol is displayed.
Unfortunately you cannot writ a sq. root symbol on the computer, so you could just say 'squared.'
If unspecified, the square root is the principal root, which is the positive root.
The square root symbol (√) was first used in 1525, by Christoph Rudolff, and is called a radical.