Alright, let's work through 6639 times 2458 step by step
6639 × 2458 = 2458 × (6639)
+ 2458 × 9 producing 22122
+ 2458 × 30 giving us 73740
+ 2458 × 600 that results in 1474800
+ 2458 × 6000 yielding 14748000

= 16318662
