Alright, let's work through 2640 times 3331 step by step
2640 × 3331 = 3331 × (2640)
+ 3331 × 0 what gives us 0
+ 3331 × 40 which equals 133240
+ 3331 × 600 that equals 1998600
+ 3331 × 2000 giving us 6662000

= 8793840
