No problem, we've got 6415 and 1584 to multiply
6415 × 1584 = 1584 × (6415)
+ 1584 × 5 that is equal 7920
+ 1584 × 10 what gives us 15840
+ 1584 × 400 which equals 633600
+ 1584 × 6000 producing 9504000

= 10161360
