Alright, let's work through 1640 times 3602 step by step
1640 × 3602 = 3602 × (1640)
+ 3602 × 0 which equals 0
+ 3602 × 40 yielding 144080
+ 3602 × 600 that equals 2161200
+ 3602 × 1000 what gives us 3602000

= 5907280
