Alright, let's work through 3121 times 5543 step by step
3121 × 5543 = 5543 × (3121)
+ 5543 × 1 that results in 5543
+ 5543 × 20 that is equal 110860
+ 5543 × 100 that is equal 554300
+ 5543 × 3000 giving us 16629000

= 17299703
