Square Root Calculator › Square root of 408
Square Root of 408
√408 ≈ 20.19901
408 is not a perfect square, so √408 is an irrational number that is approximately 20.19901. In simplified radical form, √408 = 2√102.
√408 lies between √400 = 20 and √441 = 21.
| Number | 408 |
| Square root (decimal) | 20.19901 |
| Simplified radical | 2√102 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 408 a perfect square?
No, 408 is not a perfect square, so its square root is irrational and approximately 20.19901.
What is the square root of 408 in simplest radical form?
√408 = 2√102 in simplest radical form.