Alright, let's work through 3688 times 543 step by step
3688 × 543 = 543 × (3688)
+ 543 × 8 what gives us 4344
+ 543 × 80 that is equal 43440
+ 543 × 600 what gives us 325800
+ 543 × 3000 giving us 1629000

= 2002584
