Square Root Calculator › Square root of 243
Square Root of 243
√243 ≈ 15.588457
243 is not a perfect square, so √243 is an irrational number that is approximately 15.588457. In simplified radical form, √243 = 9√3.
√243 lies between √225 = 15 and √256 = 16.
| Number | 243 |
| Square root (decimal) | 15.588457 |
| Simplified radical | 9√3 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 243 a perfect square?
No, 243 is not a perfect square, so its square root is irrational and approximately 15.588457.
What is the square root of 243 in simplest radical form?
√243 = 9√3 in simplest radical form.