Another way is the formula:
Πr^2. (pi)(r) squared
Hope this helps!
8 ÷ 544 = 0.0147058824, 544 ÷ 8 = 68
143 is composite. To be prime it has to have only 2 divisors i.e it's self and one but since it has 4 divisors ( 143, 1, 11 and 13) it is composite.
