No problem, we've got 9536 and 643 to multiply
9536 × 643 = 643 × (9536)
+ 643 × 6 yielding 3858
+ 643 × 30 what gives us 19290
+ 643 × 500 yielding 321500
+ 643 × 9000 which equals 5787000

= 6131648
