Bluebulb Projects' The Measure of Things presents:
600 is about seven-tenths the number of Population of Vatican City.
In other words, it's 0.713 times the count of Population of Vatican City, and the count of Population of Vatican City is 1.4 times that amount.
(a.k.a. Vatican City State, a.k.a. Stato della Città del Vaticano
, a.k.a. Status Civitatis Vaticanae
) (Rome, Italy) (2014 estimates; permanent residents only)