Alright, let's work through 4003 times 1537 step by step
4003 × 1537 = 1537 × (4003)
+ 1537 × 3 what gives us 4611
+ 1537 × 00 producing 0
+ 1537 × 000 that is equal 0
+ 1537 × 4000 giving us 6148000

= 6152611
