Alright, let's work through 3405 times 6402 step by step
3405 × 6402 = 6402 × (3405)
+ 6402 × 5 that is equal 32010
+ 6402 × 00 that results in 0
+ 6402 × 400 that results in 2560800
+ 6402 × 3000 what gives us 19206000

= 21798810
