Alright, let's work through 6409 times 4305 step by step
6409 × 4305 = 4305 × (6409)
+ 4305 × 9 that results in 38745
+ 4305 × 00 that is equal 0
+ 4305 × 400 that equals 1722000
+ 4305 × 6000 yielding 25830000

= 27590745
