Alright, let's work through 2143 times 1556 step by step
2143 × 1556 = 1556 × (2143)
+ 1556 × 3 that is equal 4668
+ 1556 × 40 resulting in 62240
+ 1556 × 100 that equals 155600
+ 1556 × 2000 that is equal 3112000

= 3334508
