Use the algorithm method.
| | | | | | | 2 | 5 | 5 | 5 |
| × | | | | | 5 | 5 | 5 | 5 | 1 | 5 |
|
| | | | | | 1 | 2 | 2 | 2 | |
| | | | | | 1 | 2 | 7 | 7 | 5 |
| | | | | | 2 | 5 | 5 | 5 | 0 |
| | | | 1 | 2 | 2 | 2 | | | |
| | | | 1 | 2 | 7 | 7 | 5 | 0 | 0 |
| | | 1 | 2 | 2 | 2 | | | | |
| | | 1 | 2 | 7 | 7 | 5 | 0 | 0 | 0 |
| | 1 | 2 | 2 | 2 | | | | | |
| | 1 | 2 | 7 | 7 | 5 | 0 | 0 | 0 | 0 |
| 1 | 2 | 2 | 2 | | | | | | |
| 1 | 2 | 7 | 7 | 5 | 0 | 0 | 0 | 0 | 0 |
|
| | 1 | 1 | 2 | 2 | 2 | 1 | 1 | | |
| 1 | 4 | 1 | 9 | 3 | 4 | 0 | 8 | 2 | 5 |
Therefore, \(2555\times 555515=1419340825\).
\[1419340825\]
1419340825
