# What is the square root of 399

The short answer is $$\sqrt{ 399 } = 19.974984355438$$.

If that's all you're looking for, thanks for coming by. But if you're interested in the hows and whys behind square roots, continue reading and we'll tell you all about the square root of 399.

## 399 is not a perfect square

Let's look at some math

$$\LARGE \sqrt{ 399 } = 19.974984355438$$

Note that $$19.974984355438$$ is not a whole number, therefore 399 is not a perfect square.

The next perfect square greater than 399 is 400. The previous perfect square less than 399 is 361.

## Square root of 399 as an exponent

Any square root can be converted to a number with a fractional exponent. In the case of 399 the following two values are equal.

$$\LARGE \sqrt{ 399 } = 399^{^1/_2}$$

## Square root of 399 as a fraction

Since 399 is not a perfect square, sometimes we might want to get a fractional estimate of the square root value. In the case of 399 that value is $$\Large 19 \frac{38}{39}$$.

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