Alright, let's work through 4391 times 7591 step by step
4391 × 7591 = 7591 × (4391)
+ 7591 × 1 which equals 7591
+ 7591 × 90 giving us 683190
+ 7591 × 300 that is equal 2277300
+ 7591 × 4000 which equals 30364000

= 33332081
