Alright, let's work through 2588 times 1638 step by step
2588 × 1638 = 1638 × (2588)
+ 1638 × 8 which equals 13104
+ 1638 × 80 resulting in 131040
+ 1638 × 500 that is equal 819000
+ 1638 × 2000 resulting in 3276000

= 4239144
