Alright, let's work through 8604 times 8621 step by step
8604 × 8621 = 8621 × (8604)
+ 8621 × 4 giving us 34484
+ 8621 × 00 what gives us 0
+ 8621 × 600 which equals 5172600
+ 8621 × 8000 producing 68968000

= 74175084
