Alright, let's work through 1866 times 2158 step by step
1866 × 2158 = 2158 × (1866)
+ 2158 × 6 which equals 12948
+ 2158 × 60 giving us 129480
+ 2158 × 800 that equals 1726400
+ 2158 × 1000 what gives us 2158000

= 4026828
