Alright, let's work through 4664 times 3996 step by step
4664 × 3996 = 3996 × (4664)
+ 3996 × 4 what gives us 15984
+ 3996 × 60 yielding 239760
+ 3996 × 600 what gives us 2397600
+ 3996 × 4000 that equals 15984000

= 18637344
