Alright, let's work through 1609 times 8609 step by step
1609 × 8609 = 8609 × (1609)
+ 8609 × 9 that is equal 77481
+ 8609 × 00 that results in 0
+ 8609 × 600 yielding 5165400
+ 8609 × 1000 resulting in 8609000

= 13851881
