Alright, let's work through 6440 times 9097 step by step
6440 × 9097 = 9097 × (6440)
+ 9097 × 0 giving us 0
+ 9097 × 40 that equals 363880
+ 9097 × 400 what gives us 3638800
+ 9097 × 6000 giving us 54582000

= 58584680
