Alright, let's work through 5840 times 2638 step by step
5840 × 2638 = 2638 × (5840)
+ 2638 × 0 that equals 0
+ 2638 × 40 yielding 105520
+ 2638 × 800 that results in 2110400
+ 2638 × 5000 yielding 13190000

= 15405920
