Alright, let's work through 2009 times 4001 step by step
2009 × 4001 = 4001 × (2009)
+ 4001 × 9 which equals 36009
+ 4001 × 00 producing 0
+ 4001 × 000 that results in 0
+ 4001 × 2000 yielding 8002000

= 8038009
