Alright, let's work through 5999 times 6637 step by step
5999 × 6637 = 6637 × (5999)
+ 6637 × 9 what gives us 59733
+ 6637 × 90 yielding 597330
+ 6637 × 900 that is equal 5973300
+ 6637 × 5000 that results in 33185000

= 39815363
