Alright, let's work through 3983 times 6273 step by step
3983 × 6273 = 6273 × (3983)
+ 6273 × 3 which equals 18819
+ 6273 × 80 which equals 501840
+ 6273 × 900 giving us 5645700
+ 6273 × 3000 which equals 18819000

= 24985359
