Alright, let's work through 4109 times 3994 step by step
4109 × 3994 = 3994 × (4109)
+ 3994 × 9 yielding 35946
+ 3994 × 00 that equals 0
+ 3994 × 100 that is equal 399400
+ 3994 × 4000 yielding 15976000

= 16411346
