Alright, let's work through 1001 times 7886 step by step
1001 × 7886 = 7886 × (1001)
+ 7886 × 1 that is equal 7886
+ 7886 × 00 producing 0
+ 7886 × 000 what gives us 0
+ 7886 × 1000 giving us 7886000

= 7893886
