Alright, let's work through 4190 times 1620 step by step
4190 × 1620 = 1620 × (4190)
+ 1620 × 0 giving us 0
+ 1620 × 90 resulting in 145800
+ 1620 × 100 that is equal 162000
+ 1620 × 4000 that equals 6480000

= 6787800
