Square Root Calculator › Square root of 406
Square Root of 406
√406 ≈ 20.149442
406 is not a perfect square, so √406 is an irrational number that is approximately 20.149442. In simplified radical form, √406 = √406.
√406 lies between √400 = 20 and √441 = 21.
| Number | 406 |
| Square root (decimal) | 20.149442 |
| Simplified radical | √406 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 406 a perfect square?
No, 406 is not a perfect square, so its square root is irrational and approximately 20.149442.
What is the square root of 406 in simplest radical form?
√406 = √406 in simplest radical form.