Alright, let's work through 8509 times 2048 step by step
8509 × 2048 = 2048 × (8509)
+ 2048 × 9 giving us 18432
+ 2048 × 00 that equals 0
+ 2048 × 500 yielding 1024000
+ 2048 × 8000 that is equal 16384000

= 17426432
