With great difficultly because it is an irrational number and it is about 14.69693846 by using a calculator
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sqrt(216) = 14.6969 (to 4 dp).
√216 = 6√6 = 14.697
no, it is not a perfect square, but it can be reduced to: 6 time the square root of 6
There are no two identical whole numbers that multiply to get 216. However, 14.69694 * 14.69694 = ~216 As a sidenote, your question is the same as asking "what is the square root of 216?"