It would be radical 170, because 170 cannot factor anything outside of the radical.
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The square root of 170 is 13.0384... Since it does not have an integer as its square root, it is not a square number.
169
170.0
No. The only square roots of integers that are rational numbers only when the integer is a perfect square.
12x12=144 13x13=169 14x14=198 170 is close to 13x13 but less than 14x14