What is the square root of 66?

Answer

8.124038

66 is not a perfect square8.124038² = 8.124038² ≈ 668.124038 × 8.124038 = ≈ 66

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How We Calculated This

√n — the number which, multiplied by itself, equals n

√66 = 8.124038

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Calculated using verified formulas. Last updated March 2026.