Alright, let's work through 3926 times 6003 step by step
3926 × 6003 = 6003 × (3926)
+ 6003 × 6 giving us 36018
+ 6003 × 20 that is equal 120060
+ 6003 × 900 that equals 5402700
+ 6003 × 3000 resulting in 18009000

= 23567778
