Alright, let's work through 1854 times 647 step by step
1854 × 647 = 647 × (1854)
+ 647 × 4 that is equal 2588
+ 647 × 50 yielding 32350
+ 647 × 800 yielding 517600
+ 647 × 1000 that equals 647000

= 1199538
