Yes, since 0.64 can be written as (0.8)2 or (-0.8)2.
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No, 80 is a not perfect square.
Yes, a perfect square is a number that has an integer square root.
No, 3.6 is not a perfect square. A perfect square is defined as a number that has a whole number for a square root. In other words, there's no whole number that, when multiplied by itself, equals 3.6.
No, a perfect square number will ALWAYS ends in 0,1,4,5,6,9
Sometimes the square root of a positive number can be irrational, as in the square root of 2 (which is a non-perfect square number), but sometimes it is a rational number, as in the square root of 25 (which is a perfect square number).