Alright, let's work through 5603 times 4532 step by step
5603 × 4532 = 4532 × (5603)
+ 4532 × 3 giving us 13596
+ 4532 × 00 what gives us 0
+ 4532 × 600 that equals 2719200
+ 4532 × 5000 which equals 22660000

= 25392796
