Alright, let's work through 6791 times 1659 step by step
6791 × 1659 = 1659 × (6791)
+ 1659 × 1 resulting in 1659
+ 1659 × 90 that is equal 149310
+ 1659 × 700 that equals 1161300
+ 1659 × 6000 giving us 9954000

= 11266269
