Alright, let's work through 1966 times 1990 step by step
1966 × 1990 = 1990 × (1966)
+ 1990 × 6 that equals 11940
+ 1990 × 60 that is equal 119400
+ 1990 × 900 giving us 1791000
+ 1990 × 1000 producing 1990000

= 3912340
