Alright, let's work through 1603 times 3877 step by step
1603 × 3877 = 3877 × (1603)
+ 3877 × 3 resulting in 11631
+ 3877 × 00 what gives us 0
+ 3877 × 600 yielding 2326200
+ 3877 × 1000 which equals 3877000

= 6214831
