Ez LINQ Noob Question

How can I make this return a true/false? Is there a way to clean this up without adding a

.Count() > 0

.Count() > 0

call?

bool onlyContainsQuarters = allDates.Where(x => quarterEndMonths.Any(prefix => x.StartsWith(prefix)));

bool onlyContainsQuarters = allDates.Where(x => quarterEndMonths.Any(prefix => x.StartsWith(prefix)));