No problem, we've got 5640 and 1638 to multiply
5640 × 1638 = 1638 × (5640)
+ 1638 × 0 which equals 0
+ 1638 × 40 which equals 65520
+ 1638 × 600 yielding 982800
+ 1638 × 5000 resulting in 8190000

= 9238320
