√2 ≈ 1.4142
√2 is an irrational number, so its decimals never end or repeat. It sits between 1 and 2 because 1² = 1 and 2² = 4.
| Decimal places | Value |
|---|---|
| 0 | 1 |
| 1 | 1.4 |
| 2 | 1.41 |
| 3 | 1.414 |
| 4 | 1.4142 |
| 5 | 1.41421 |
| 10 (digits) | 1.4142135624 |
2 has no perfect-square factor other than 1, so √2 is already in simplest radical form.
1.4142 × 1.4142 ≈ 2.0000, which is very close to 2.
Need another number? Use the square root calculator (also cube roots and other roots).
| Number | Square root |
|---|---|
| 1 | 1 |
| 3 | 1.7321 |
| 4 | 2 |
| 5 | 2.2361 |
| 6 | 2.4495 |