Square Root Calculator › Square root of 423
Square Root of 423
√423 ≈ 20.566964
423 is not a perfect square, so √423 is an irrational number that is approximately 20.566964. In simplified radical form, √423 = 3√47.
√423 lies between √400 = 20 and √441 = 21.
| Number | 423 |
| Square root (decimal) | 20.566964 |
| Simplified radical | 3√47 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 423 a perfect square?
No, 423 is not a perfect square, so its square root is irrational and approximately 20.566964.
What is the square root of 423 in simplest radical form?
√423 = 3√47 in simplest radical form.