Alright, let's work through 2431 times 6407 step by step
2431 × 6407 = 6407 × (2431)
+ 6407 × 1 yielding 6407
+ 6407 × 30 giving us 192210
+ 6407 × 400 that is equal 2562800
+ 6407 × 2000 that results in 12814000

= 15575417
