Alright, let's work through 2045 times 1239 step by step
2045 × 1239 = 1239 × (2045)
+ 1239 × 5 yielding 6195
+ 1239 × 40 what gives us 49560
+ 1239 × 000 yielding 0
+ 1239 × 2000 giving us 2478000

= 2533755
