Alright, let's work through 3501 times 1602 step by step
3501 × 1602 = 1602 × (3501)
+ 1602 × 1 that is equal 1602
+ 1602 × 00 which equals 0
+ 1602 × 500 resulting in 801000
+ 1602 × 3000 producing 4806000

= 5608602
