Alright, let's work through 2640 times 6980 step by step
2640 × 6980 = 6980 × (2640)
+ 6980 × 0 what gives us 0
+ 6980 × 40 producing 279200
+ 6980 × 600 that equals 4188000
+ 6980 × 2000 resulting in 13960000

= 18427200
