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The '''square root''' of a number ''X'' is the number that, multiplied by itself, results in ''X''.  The symbol for the square root of ''X'' is <math>\sqrt{X}</math>.  Many computer languages and spreadsheet programs use "''sqr(X)''" to express this, as do people when mathematical symbols are not conveniently available.

The '''square root''' of a number ''X'' is the number that, multiplied by itself, results in ''X''.  The symbol for the square root of ''X'' is <math>\sqrt{X}</math>.  Many computer languages and spreadsheet programs use "''sqr(X)''" or "''sqrt(X)''"to express this, as do people when mathematical symbols are not conveniently available.

Some square roots are relatively simple [[whole number|whole numbers]], for example, 3 is the square root of 9.  Others are less amenable to expression, such as the square root of 2 (1.414...), which has been proven to be an [[irrational number]].

Some square roots are relatively simple [[whole number|whole numbers]], for example, 3 is the square root of 9.  Others are less amenable to expression, such as the square root of 2 (1.414...), which has been proven to be an [[irrational number]].