No problem, we've got 9615 and 648 to multiply
9615 × 648 = 648 × (9615)
+ 648 × 5 what gives us 3240
+ 648 × 10 giving us 6480
+ 648 × 600 yielding 388800
+ 648 × 9000 what gives us 5832000

= 6230520
