Alright, let's work through 3191 times 5207 step by step
3191 × 5207 = 5207 × (3191)
+ 5207 × 1 resulting in 5207
+ 5207 × 90 what gives us 468630
+ 5207 × 100 yielding 520700
+ 5207 × 3000 that is equal 15621000

= 16615537
