Alright, let's work through 1045 times 1638 step by step
1045 × 1638 = 1638 × (1045)
+ 1638 × 5 that results in 8190
+ 1638 × 40 that results in 65520
+ 1638 × 000 what gives us 0
+ 1638 × 1000 producing 1638000

= 1711710
