This is a simple math extension. Which functions or constants should I add? It has the following functions:

isEven(double number)
 returns true if number is even, false otherwise
 even numbers can be divided by two without remainders

isPrime(double number)
 returns true if the number is a prime number, false otherwise

isInteger(double number)
 returns true if the number is whole, false otherwise

isPositive(double number)
 returns true if the number is greater than zero, false otherwise
 The constants Ď€, e, c (in m/s), g (in m/s^2)
 mapping numbers from a scale to a scale
 conversion of
 degree Celsius toFahrenheit
 degree Fahrenheit toCelsius
 miles toKilometers
 kilometers toMiles
The extension can be found in my GitHub repo. Please post all suggestions and issues here.
Changelog
20170905: Initial release
20170918: v2 is out
20180209: v3 fixes an error with the isPrime function