That is in its simplest form. You can't simplify sqrt(166) any more then it is. The decimal approximation can be found by (166)^1/2
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The square root of 166 is 12.88409873
166
166 2/3 cannot be simplified further.
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There are thousands of square numbers. A square number is the answer to a number multiplied by itself. For example, 1 x 1 is 1, 1 is the square number. Another example, 16 x 16 is 166, 166 is the square number.