Alright, let's work through 2664 times 2581 step by step
2664 × 2581 = 2581 × (2664)
+ 2581 × 4 giving us 10324
+ 2581 × 60 what gives us 154860
+ 2581 × 600 which equals 1548600
+ 2581 × 2000 yielding 5162000

= 6875784
