√91 ≈ 9.5394
√91 is an irrational number, so its decimals never end or repeat. It sits between 9 and 10 because 9² = 81 and 10² = 100.
| Decimal places | Value |
|---|---|
| 0 | 10 |
| 1 | 9.5 |
| 2 | 9.54 |
| 3 | 9.539 |
| 4 | 9.5394 |
| 5 | 9.53939 |
| 10 (digits) | 9.5393920142 |
91 has no perfect-square factor other than 1, so √91 is already in simplest radical form.
9.5394 × 9.5394 ≈ 91.0002, which is very close to 91.
Need another number? Use the square root calculator (also cube roots and other roots).
| Number | Square root |
|---|---|
| 87 | 9.3274 |
| 88 | 9.3808 |
| 89 | 9.4340 |
| 90 | 9.4868 |
| 92 | 9.5917 |
| 93 | 9.6437 |
| 94 | 9.6954 |
| 95 | 9.7468 |