No problem, we've got 6631 and 999 to multiply
6631 × 999 = 999 × (6631)
+ 999 × 1 which equals 999
+ 999 × 30 that is equal 29970
+ 999 × 600 that results in 599400
+ 999 × 6000 resulting in 5994000

= 6624369
