Alright, let's work through 3907 times 2091 step by step
3907 × 2091 = 2091 × (3907)
+ 2091 × 7 producing 14637
+ 2091 × 00 that is equal 0
+ 2091 × 900 giving us 1881900
+ 2091 × 3000 that results in 6273000

= 8169537
