Square Root Calculator › Square root of 261
Square Root of 261
√261 ≈ 16.155494
261 is not a perfect square, so √261 is an irrational number that is approximately 16.155494. In simplified radical form, √261 = 3√29.
√261 lies between √256 = 16 and √289 = 17.
| Number | 261 |
| Square root (decimal) | 16.155494 |
| Simplified radical | 3√29 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 261 a perfect square?
No, 261 is not a perfect square, so its square root is irrational and approximately 16.155494.
What is the square root of 261 in simplest radical form?
√261 = 3√29 in simplest radical form.