Alright, let's work through 2131 times 3687 step by step
2131 × 3687 = 3687 × (2131)
+ 3687 × 1 that results in 3687
+ 3687 × 30 yielding 110610
+ 3687 × 100 that results in 368700
+ 3687 × 2000 that is equal 7374000

= 7856997
