No, at least, 70 isn't a perfect square. The nearest perfect squares are 8 squared = 64, and 9 squared = 81.
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The square root of 70 is an irrational number
The Number is 70
Any positive number has two square roots, a positive square root and a negative square root. In this instance, the square root of 4900 is equal to ±70 (that is, 70 and –70).
Eight
Below 70: 82 = 64. Above 70: 92 = 81. 64 is nearer.