English Wikipedia has an article on:square rootWikipedia (mathematics) The number which, when squared, yields another number.
The square roots of 4 are 2 and −2, the square root of 0 is 0, and the square roots of −4 are 2i and −2i.
(mathematics) The positive number which, when squared, yields another number; the principal square root.
The square root of 4 is 2. No negative real square roots exist. Negative numbers have no real square roots.
The intelligence of the creature known as a crowd, is the square root of the number of people in it. Terry Pratchett
Irrationality is the square root of all evil. Douglas Hofstadter
Think of Adam and Eve like an imaginary number, like the square root of minus one: you can never see any concrete proof that it exists, but if you include it in your equations, you can calculate all manner of things that couldn't be imagined without it. Philip Pullman
The square root of I is I. Vladimir Nabokov
The theme is the theme of humiliation, which is the square root of sin, as opposed to the freedom from humiliation, and love, which is the square root of wonderful. Carson McCullers
There was a young fellow from Trinity, Who took the square root of infinity. But the number of digits, Gave him the fidgets; He dropped Math and took up Divinity. George Gamow