Alright, let's work through 1804 times 2007 step by step
1804 × 2007 = 2007 × (1804)
+ 2007 × 4 what gives us 8028
+ 2007 × 00 that results in 0
+ 2007 × 800 resulting in 1605600
+ 2007 × 1000 that results in 2007000

= 3620628
