It asks for the number that, when raised to the power of 2, equals 427.
What is the Square Root of 427?
The square root of 427 is 20.6639783198. Calculate another value or review the exact form, nearby perfect powers, and verification.
Answer
Square Root√427 = 20.6639783198
CalculatedNon-perfect squareIrrational
Exact form√427
Perfect squareNo
Number typeIrrational
Verification20.66397831982 ≈ 427
Share result
On this page
How the answer is calculated
We solve x2 = 427. The resulting value is x = 20.6639783198.
Verification: 20.66397831982 ≈ 427.
Simplified radical form
The square root of 427 in simplified radical form is √427.
There are no square factors that can be taken outside the radical, so √427 is already in simplest radical form.
Nearest Perfect squares
| Position | Base | Value |
|---|---|---|
| Lower or equal | 20 | 400 |
| Upper or equal | 21 | 441 |
Nearby square roots
Number properties
Is 427 a perfect square?
No. Its square root is not a whole number.
Is the square root rational or irrational?
√427 is irrational because 427 is not a perfect square.
Visual guide
Square Root function graph
See how the result changes as the input moves across positive and negative values. Square roots are shown for non-negative inputs; cube roots continue through negative inputs.
Common questions
Frequently asked questions
The decimal answer is rounded for display; the radical form remains exact.
Yes. Enter any supported number in the calculator above and select Calculate.