Alright, let's work through 2046 times 3902 step by step
2046 × 3902 = 3902 × (2046)
+ 3902 × 6 that is equal 23412
+ 3902 × 40 producing 156080
+ 3902 × 000 which equals 0
+ 3902 × 2000 giving us 7804000

= 7983492
