Alright, let's work through 2633 times 643 step by step
2633 × 643 = 643 × (2633)
+ 643 × 3 that is equal 1929
+ 643 × 30 yielding 19290
+ 643 × 600 giving us 385800
+ 643 × 2000 that is equal 1286000

= 1693019
