√391 = 19.7737199333. 391 is not a perfect square; the result is irrational.

Is 391 a perfect square?

No, 391 is not a perfect square. Its square root is irrational.

What is 19.7737199333 squared?

19.7737199333 squared is approximately 391. (19.7737199333)² ≈ 391

Instant answer with step-by-step solution

√391 = 19.7737199333

√391 = 19.7737199333

⚠ 391 is not a perfect square — result rounded to 10 significant figures

We need to find √391 — a number that when multiplied by itself equals 391.
391 is not a perfect square. Its square root is irrational.
It falls between √361 = 19 and √400 = 20.
Using the formula √N = N^(1/2): √391 = 391^0.5 = 19.7737199333
Verification: 19.7737199333 × 19.7737199333 ≈ 391 ✓ (rounded to 10 significant figures)

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