Alright, let's work through 1646 times 6173 step by step
1646 × 6173 = 6173 × (1646)
+ 6173 × 6 that equals 37038
+ 6173 × 40 yielding 246920
+ 6173 × 600 that results in 3703800
+ 6173 × 1000 that results in 6173000

= 10160758
