How to change the ErrorMessage for int model validation in ASP.NET MVC?

Yes, you can use Data annotations extensions, mark your property as the following:

[Required(ErrorMessage = "Please enter how many Stream Entries are displayed per page.")]
[Range(0, 250, ErrorMessage = "Please enter a number between 0 and 250.")]
[Column]
[DataAnnotationsExtensions.Integer(ErrorMessage = "Please enter a valid number.")]
public int StreamEntriesPerPage { get; set; }