Alright, let's work through 2005 times 8311 step by step
2005 × 8311 = 8311 × (2005)
+ 8311 × 5 yielding 41555
+ 8311 × 00 which equals 0
+ 8311 × 000 that equals 0
+ 8311 × 2000 giving us 16622000

= 16663555
