What is the square root of 40?

Answer

6.324555

40 is not a perfect square6.324555² = 6.324555² ≈ 406.324555 × 6.324555 = ≈ 40

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How We Calculated This

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

√40 = 6.324555

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What is the square root of 1?1 (exact)What is the square root of 2?1.414214 What is the square root of 3?1.732051 What is the square root of 4?2 (exact)What is the square root of 5?2.236068

Calculated using verified formulas. Last updated March 2026.