sqrt(4356) = ±66
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576, 4356, 6400 are perfect squares.
66 - and the calculator built into WINDOWS would have told you that !
Any positive number has two square roots, one positive and one corresponding negative. In this instance, sqrt(4356) = ±66 (that is, plus or minus 66).
The principal square root is the non-negative square root.
662 = 4356 4356 lies between 4355 and 4357