Alright, let's work through 6411 times 1605 step by step
6411 × 1605 = 1605 × (6411)
+ 1605 × 1 that results in 1605
+ 1605 × 10 what gives us 16050
+ 1605 × 400 that equals 642000
+ 1605 × 6000 giving us 9630000

= 10289655
