64
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The only square number of an integer between 60 and 70 is 64, which is 8 squared.
64
No, there aren't any square numbers between 70 and 80. From 70 to 80, no number has a perfect square root, so no square number exists between 70 to 80.
The square root of 70 can not be simplified, because the number 70 is not divisible by any perfect square (4, 9, 16, 25, 36, 49).
64 is 82