Alright, let's work through 1002 times 2136 step by step
1002 × 2136 = 2136 × (1002)
+ 2136 × 2 that is equal 4272
+ 2136 × 00 yielding 0
+ 2136 × 000 resulting in 0
+ 2136 × 1000 resulting in 2136000

= 2140272
