Infolity
  1. Home
  2. Calculators
  3. Square Root

What is the Square Root of 402?

The square root of 402 is 20.0499376558. Calculate another value or review the exact form, nearby perfect powers, and verification.

Answer

Square Root√402 = 20.0499376558
CalculatedNon-perfect squareIrrational
Exact form√402
Perfect squareNo
Number typeIrrational
Verification20.04993765582 ≈ 402

On this page

How the answer is calculated

We solve x2 = 402. The resulting value is x = 20.0499376558.

Verification: 20.04993765582 ≈ 402.

Simplified radical form

The square root of 402 in simplified radical form is √402.

There are no square factors that can be taken outside the radical, so √402 is already in simplest radical form.

Nearest Perfect squares

PositionBaseValue
Lower or equal20400
Upper or equal21441

Nearby square roots

NumberSquare root
√39919.9749843554
√40020
√40120.0249843945
√40220.0499376558
√40320.0748598999
√40420.0997512422
√40520.1246117975

Number properties

Is 402 a perfect square?

No. Its square root is not a whole number.

Is the square root rational or irrational?

√402 is irrational because 402 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

It asks for the number that, when raised to the power of 2, equals 402.