Alright, let's work through 1556 times 1663 step by step
1556 × 1663 = 1663 × (1556)
+ 1663 × 6 which equals 9978
+ 1663 × 50 what gives us 83150
+ 1663 × 500 that is equal 831500
+ 1663 × 1000 that results in 1663000

= 2587628
