Alright, let's work through 7791 times 8491 step by step
7791 × 8491 = 8491 × (7791)
+ 8491 × 1 that results in 8491
+ 8491 × 90 which equals 764190
+ 8491 × 700 that equals 5943700
+ 8491 × 7000 resulting in 59437000

= 66153381
