Alright, let's work through 4031 times 397 step by step
4031 × 397 = 397 × (4031)
+ 397 × 1 yielding 397
+ 397 × 30 that results in 11910
+ 397 × 000 giving us 0
+ 397 × 4000 which equals 1588000

= 1600307
