Alright, let's work through 6210 times 4009 step by step
6210 × 4009 = 4009 × (6210)
+ 4009 × 0 yielding 0
+ 4009 × 10 that is equal 40090
+ 4009 × 200 giving us 801800
+ 4009 × 6000 that results in 24054000

= 24895890
