Alright, let's work through 2154 times 7819 step by step
2154 × 7819 = 7819 × (2154)
+ 7819 × 4 resulting in 31276
+ 7819 × 50 giving us 390950
+ 7819 × 100 producing 781900
+ 7819 × 2000 that is equal 15638000

= 16842126
