Perfect Square
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You call them principal square roots.
A square root is the number that is squared to obtain a square number so it can therefore be considered a root of that square number (or basis for that square number). It can also be noted that each square number, when displayed using dots will always form a perfect square perhaps giving it it's name e.g. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . etc...
Any positive number x has two square roots: one positive and one negative. For example, +3 and -3 are both square roots of 9. Using a brilliant leap of imagination, mathematicians decided to call the first of these the positive root!
The square of the number
A square number