Alright, let's work through 4128 times 2591 step by step
4128 × 2591 = 2591 × (4128)
+ 2591 × 8 that is equal 20728
+ 2591 × 20 yielding 51820
+ 2591 × 100 resulting in 259100
+ 2591 × 4000 producing 10364000

= 10695648
