This number does not have a universal meaning that is the same in every dream. Instead, it refers to some number or value in your life, such as a date (May, '43 or March '54) an address or room number, a time of day (5:43 a.m. or p.m.) or even a part of a telephone or license number.
543
543 is not prime. 543 = 3 * 181
543
543
543 + 78900000 = 78900543
1 3 181 543.
198
87646555555555555553248777775813 + 543 = 87646555555555555553248777776356
543 over 1
785,423 multiplied by 543 is 426,484,689
40% of 543 is equal to 217.2.
181