Yes.
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Yes.
It is not a perfect square which means that it will not divide evenly but the square root of 88 is 9.38083152
No.
The square root of 6 is... 2.449489742783178 !
No 81 is (9 x 9) 100 is (10 x 10) 88 is not - at least not of a whole number Square root is 9.3808315 etc