The square roots (not sqare route!) of 99999999999999999999999 are ±316,227,766,016.8 approx.
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40
The square root of 81 is 9 as in 9 x 9 = 81
In math i=√(-1), in physics and engineering j=√(-1), and i2 or j2 =-1.
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The square (not sqare) root is approx 23031.054