Alright, let's work through 2186 times 820 step by step
2186 × 820 = 820 × (2186)
+ 820 × 6 that is equal 4920
+ 820 × 80 that results in 65600
+ 820 × 100 what gives us 82000
+ 820 × 2000 yielding 1640000

= 1792520
