The square root of 644 calculated to 10 decimal places.
| Number | Square Root | Perfect Square? |
|---|---|---|
| 639 | 25.2784493195 | No |
| 640 | 25.2982212813 | No |
| 641 | 25.3179778023 | No |
| 642 | 25.3377189186 | No |
| 643 | 25.3574446662 | No |
| 644 | 25.3771550809 | No |
| 645 | 25.3968501984 | No |
| 646 | 25.4165300543 | No |
| 647 | 25.4361946840 | No |
| 648 | 25.4558441227 | No |
| 649 | 25.4754784057 | No |
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