Alright, let's work through 1644 times 2798 step by step
1644 × 2798 = 2798 × (1644)
+ 2798 × 4 that is equal 11192
+ 2798 × 40 producing 111920
+ 2798 × 600 that equals 1678800
+ 2798 × 1000 yielding 2798000

= 4599912
