Alright, let's work through 5821 times 654 step by step
5821 × 654 = 654 × (5821)
+ 654 × 1 what gives us 654
+ 654 × 20 that is equal 13080
+ 654 × 800 giving us 523200
+ 654 × 5000 which equals 3270000

= 3806934
