Alright, let's work through 2005 times 4121 step by step
2005 × 4121 = 4121 × (2005)
+ 4121 × 5 which equals 20605
+ 4121 × 00 producing 0
+ 4121 × 000 that is equal 0
+ 4121 × 2000 that is equal 8242000

= 8262605
