Alright, let's work through 5989 times 3989 step by step
5989 × 3989 = 3989 × (5989)
+ 3989 × 9 what gives us 35901
+ 3989 × 80 that equals 319120
+ 3989 × 900 what gives us 3590100
+ 3989 × 5000 that equals 19945000

= 23890121
