Alright, let's work through 1646 times 3727 step by step
1646 × 3727 = 3727 × (1646)
+ 3727 × 6 producing 22362
+ 3727 × 40 giving us 149080
+ 3727 × 600 which equals 2236200
+ 3727 × 1000 that equals 3727000

= 6134642
