Alright, let's work through 2938 times 6666 step by step
2938 × 6666 = 6666 × (2938)
+ 6666 × 8 what gives us 53328
+ 6666 × 30 producing 199980
+ 6666 × 900 yielding 5999400
+ 6666 × 2000 giving us 13332000

= 19584708
