Alright, let's work through 1603 times 8209 step by step
1603 × 8209 = 8209 × (1603)
+ 8209 × 3 yielding 24627
+ 8209 × 00 yielding 0
+ 8209 × 600 that results in 4925400
+ 8209 × 1000 which equals 8209000

= 13159027
