Alright, let's work through 5664 times 1998 step by step
5664 × 1998 = 1998 × (5664)
+ 1998 × 4 which equals 7992
+ 1998 × 60 giving us 119880
+ 1998 × 600 yielding 1198800
+ 1998 × 5000 giving us 9990000

= 11316672
