Alright, let's work through 3545 times 3509 step by step
3545 × 3509 = 3509 × (3545)
+ 3509 × 5 resulting in 17545
+ 3509 × 40 giving us 140360
+ 3509 × 500 what gives us 1754500
+ 3509 × 3000 giving us 10527000

= 12439405
