Square root of 6420

The square root of 6420 is 80.124902 (rounded to 6 decimal places). In simplest radical form it is 2√1605.

Square root of 6420

Pick any whole number from 1 to 10,000.

\sqrt{6420} = 2\sqrt{1605} \approx 80.124902

How to work it out

1
The square root of 6420 is the number that multiplied by itself gives 6420.
2
6420 is between the perfect squares 80² = 6400 and 81² = 6561, so its square root is between 80 and 81.
3
Pull out the biggest square factor: 6420 = 4 × 1605, so
$\sqrt{6420} = \sqrt{4 \times 1605} = 2\sqrt{1605}$
4
A calculator, or long division of digits, gives
$\sqrt{6420} \approx 80.124902$

LaTeX source of the formulas on this page

\[ \sqrt{6420} = 2\sqrt{1605} \approx 80.124902 \]
\[ \sqrt{6420} = \sqrt{4 \times 1605} = 2\sqrt{1605} \]
\[ \sqrt{6420} \approx 80.124902 \]

What is the square root of 6420?

The square root of 6420 is 80.124902 (rounded to 6 decimal places). In simplest radical form it is 2√1605.

Is 6420 a perfect square?

No. It lies between 80² = 6400 and 81² = 6561.

What is 6420 squared?

6420 × 6420 = 41216400.

What is the square root of 6420 rounded to 2 decimals?

80.12.