Alright, let's work through 6646 times 1000 step by step
6646 × 1000 = 1000 × (6646)
+ 1000 × 6 which equals 6000
+ 1000 × 40 resulting in 40000
+ 1000 × 600 giving us 600000
+ 1000 × 6000 what gives us 6000000

= 6646000
