Alright, let's work through 8384 times 8391 step by step
8384 × 8391 = 8391 × (8384)
+ 8391 × 4 giving us 33564
+ 8391 × 80 resulting in 671280
+ 8391 × 300 giving us 2517300
+ 8391 × 8000 that is equal 67128000

= 70350144
