Alright, let's work through 2304 times 639 step by step
2304 × 639 = 639 × (2304)
+ 639 × 4 that is equal 2556
+ 639 × 00 what gives us 0
+ 639 × 300 that is equal 191700
+ 639 × 2000 yielding 1278000

= 1472256
