Alright, let's work through 1584 times 4003 step by step
1584 × 4003 = 4003 × (1584)
+ 4003 × 4 producing 16012
+ 4003 × 80 producing 320240
+ 4003 × 500 that is equal 2001500
+ 4003 × 1000 resulting in 4003000

= 6340752
