Alright, let's work through 3373 times 391 step by step
3373 × 391 = 391 × (3373)
+ 391 × 3 yielding 1173
+ 391 × 70 that equals 27370
+ 391 × 300 which equals 117300
+ 391 × 3000 that results in 1173000

= 1318843
