Alright, let's work through 3974 times 1600 step by step
3974 × 1600 = 1600 × (3974)
+ 1600 × 4 that equals 6400
+ 1600 × 70 producing 112000
+ 1600 × 900 which equals 1440000
+ 1600 × 3000 yielding 4800000

= 6358400
