Evaluate
2\sqrt{1661}\approx 81.510735489
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2\sqrt{1661}
Factor 6644=2^{2}\times 1661. Rewrite the square root of the product \sqrt{2^{2}\times 1661} as the product of square roots \sqrt{2^{2}}\sqrt{1661}. Take the square root of 2^{2}.
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