Alright, let's work through 6601 times 6578 step by step
6601 × 6578 = 6578 × (6601)
+ 6578 × 1 giving us 6578
+ 6578 × 00 that is equal 0
+ 6578 × 600 that results in 3946800
+ 6578 × 6000 that equals 39468000

= 43421378
