Alright, let's work through 1686 times 2194 step by step
1686 × 2194 = 2194 × (1686)
+ 2194 × 6 producing 13164
+ 2194 × 80 that results in 175520
+ 2194 × 600 producing 1316400
+ 2194 × 1000 giving us 2194000

= 3699084
