Alright, let's work through 6391 times 8750 step by step
6391 × 8750 = 8750 × (6391)
+ 8750 × 1 yielding 8750
+ 8750 × 90 resulting in 787500
+ 8750 × 300 that results in 2625000
+ 8750 × 6000 producing 52500000

= 55921250
