Alright, let's work through 1399 times 1528 step by step
1399 × 1528 = 1528 × (1399)
+ 1528 × 9 that is equal 13752
+ 1528 × 90 yielding 137520
+ 1528 × 300 resulting in 458400
+ 1528 × 1000 yielding 1528000

= 2137672
