Square Root Calculator › Square root of 421
Square Root of 421
√421 ≈ 20.518285
421 is not a perfect square, so √421 is an irrational number that is approximately 20.518285. In simplified radical form, √421 = √421.
√421 lies between √400 = 20 and √441 = 21.
| Number | 421 |
| Square root (decimal) | 20.518285 |
| Simplified radical | √421 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 421 a perfect square?
No, 421 is not a perfect square, so its square root is irrational and approximately 20.518285.
What is the square root of 421 in simplest radical form?
√421 = √421 in simplest radical form.