Alright, let's work through 8336 times 8391 step by step
8336 × 8391 = 8391 × (8336)
+ 8391 × 6 that is equal 50346
+ 8391 × 30 resulting in 251730
+ 8391 × 300 what gives us 2517300
+ 8391 × 8000 what gives us 67128000

= 69947376
