Alright, let's work through 1584 times 2121 step by step
1584 × 2121 = 2121 × (1584)
+ 2121 × 4 giving us 8484
+ 2121 × 80 giving us 169680
+ 2121 × 500 what gives us 1060500
+ 2121 × 1000 what gives us 2121000

= 3359664
