Alright, let's work through 8416 times 9998 step by step
8416 × 9998 = 9998 × (8416)
+ 9998 × 6 giving us 59988
+ 9998 × 10 yielding 99980
+ 9998 × 400 giving us 3999200
+ 9998 × 8000 yielding 79984000

= 84143168
