Alright, let's work through 2801 times 5643 step by step
2801 × 5643 = 5643 × (2801)
+ 5643 × 1 that is equal 5643
+ 5643 × 00 which equals 0
+ 5643 × 800 what gives us 4514400
+ 5643 × 2000 which equals 11286000

= 15806043
