No problem, we've got 6591 and 1644 to multiply
6591 × 1644 = 1644 × (6591)
+ 1644 × 1 that results in 1644
+ 1644 × 90 which equals 147960
+ 1644 × 500 what gives us 822000
+ 1644 × 6000 giving us 9864000

= 10835604
