No problem, we've got 6643 and 1392 to multiply
6643 × 1392 = 1392 × (6643)
+ 1392 × 3 that equals 4176
+ 1392 × 40 that is equal 55680
+ 1392 × 600 which equals 835200
+ 1392 × 6000 resulting in 8352000

= 9247056
