No but 81 is a square number
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80 is not a square number 1 is, 4 is, 9 is, 16 is, 25 is, 36 is, 49 is, 64 is, 81 is, 100 is 80 is not
No but 81 is a square number
Yes
1,4,9,16,25,36,49,64
No, because an integer is a whole number and it's opposite (negative or positive). The square root of 80 is not a whole number.