Alright, let's work through 6488 times 715 step by step
6488 × 715 = 715 × (6488)
+ 715 × 8 yielding 5720
+ 715 × 80 that is equal 57200
+ 715 × 400 that is equal 286000
+ 715 × 6000 yielding 4290000

= 4638920
