You appear to be asking two different questions: whether a type is an array (e.g. string[]) or any collection type.
For the former, simply check property.PropertyType.IsArray.
For the latter, you have to decide what is the minimum criteria you want a type to conform to. For example, you could check for the non-generic IEnumerable by using typeof(IEnumerable).IsAssignableFrom(property.PropertyType). You can also use this for generic interfaces if you know the actual type of T, e.g. typeof(IEnumerable<int>).IsAssignableFrom(property.PropertyType).
Checking for the generic IEnumerable<T> or any other generic interface without knowing the value of T can be done by checking if property.PropertyType.GetInterface(typeof(IEnumerable<>).FullName) is not null. Note that I didn’t specify any type for T in that code. You can do the same for IList<T> or any other type you’re interested in.
For example you could use the following if you want to check for the generic IEnumerable<T>:
public bool IsPropertyACollection(PropertyInfo property)
{
return property.PropertyType.GetInterface(typeof(IEnumerable<>).FullName) != null;
}
Arrays also implement IEnumerable, so they will also return true from that method.