Square Root Calculator › Square root of 821
Square Root of 821
√821 ≈ 28.653098
821 is not a perfect square, so √821 is an irrational number that is approximately 28.653098. In simplified radical form, √821 = √821.
√821 lies between √784 = 28 and √841 = 29.
| Number | 821 |
| Square root (decimal) | 28.653098 |
| Simplified radical | √821 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 821 a perfect square?
No, 821 is not a perfect square, so its square root is irrational and approximately 28.653098.
What is the square root of 821 in simplest radical form?
√821 = √821 in simplest radical form.