Square Root Calculator › Square root of 402
Square Root of 402
√402 ≈ 20.049938
402 is not a perfect square, so √402 is an irrational number that is approximately 20.049938. In simplified radical form, √402 = √402.
√402 lies between √400 = 20 and √441 = 21.
| Number | 402 |
| Square root (decimal) | 20.049938 |
| Simplified radical | √402 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 402 a perfect square?
No, 402 is not a perfect square, so its square root is irrational and approximately 20.049938.
What is the square root of 402 in simplest radical form?
√402 = √402 in simplest radical form.