Alright, let's work through 6629 times 998 step by step
6629 × 998 = 998 × (6629)
+ 998 × 9 yielding 8982
+ 998 × 20 that results in 19960
+ 998 × 600 what gives us 598800
+ 998 × 6000 that results in 5988000

= 6615742
