Alright, let's work through 6484 times 6499 step by step
6484 × 6499 = 6499 × (6484)
+ 6499 × 4 that results in 25996
+ 6499 × 80 what gives us 519920
+ 6499 × 400 yielding 2599600
+ 6499 × 6000 resulting in 38994000

= 42139516
