Square Root Calculator › Square root of 391
Square Root of 391
√391 ≈ 19.77372
391 is not a perfect square, so √391 is an irrational number that is approximately 19.77372. In simplified radical form, √391 = √391.
√391 lies between √361 = 19 and √400 = 20.
| Number | 391 |
| Square root (decimal) | 19.77372 |
| Simplified radical | √391 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 391 a perfect square?
No, 391 is not a perfect square, so its square root is irrational and approximately 19.77372.
What is the square root of 391 in simplest radical form?
√391 = √391 in simplest radical form.