Helpers.cs

/// <summary>
/// Validadtes if a value is multiple of other number
/// </summary>
/// <param name="y">The desired multiple.</param>
/// <param name="x">Value to check.</param>
/// <returns>Returns true if value is multiple of multiple</returns>
public static bool IsMultipleOf(int y, int x)
{
    //Check possible DivisionByZero
    if (y == 0)
        throw new ArgumentException("O múltiplo deve ser maior do que 0.", nameof(y));

    //A number is multiple if the remainder value is 0.
    return (x % y) == 0;
}