Alright, let's work through 1604 times 8489 step by step
1604 × 8489 = 8489 × (1604)
+ 8489 × 4 producing 33956
+ 8489 × 00 what gives us 0
+ 8489 × 600 yielding 5093400
+ 8489 × 1000 that results in 8489000

= 13616356
