Alright, let's work through 2814 times 7815 step by step
2814 × 7815 = 7815 × (2814)
+ 7815 × 4 that results in 31260
+ 7815 × 10 that equals 78150
+ 7815 × 800 that equals 6252000
+ 7815 × 2000 that equals 15630000

= 21991410
