Alright, let's work through 1815 times 1131 step by step
1815 × 1131 = 1131 × (1815)
+ 1131 × 5 which equals 5655
+ 1131 × 10 producing 11310
+ 1131 × 800 that equals 904800
+ 1131 × 1000 that results in 1131000

= 2052765
