Square Root Calculator › Square root of 399
Square Root of 399
√399 ≈ 19.974984
399 is not a perfect square, so √399 is an irrational number that is approximately 19.974984. In simplified radical form, √399 = √399.
√399 lies between √361 = 19 and √400 = 20.
| Number | 399 |
| Square root (decimal) | 19.974984 |
| Simplified radical | √399 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 399 a perfect square?
No, 399 is not a perfect square, so its square root is irrational and approximately 19.974984.
What is the square root of 399 in simplest radical form?
√399 = √399 in simplest radical form.