isPrime returns a boolean indicating whether the input number is prime (a number greater than 1 that is only divisible by 1 and itself).
Parameters
isPrime takes no parameters.
Usage On Numbers
// Basic usage
num = 17
log num.isPrime()
// true
// 17 is prime
num = 16
log num.isPrime()
// false
// 16 is not prime (divisible by 1, 2, 4, 8, 16)
// Works with larger numbers
log 997.isPrime()
// true
// 997 is prime
// Special cases
log 1.isPrime()
// false
// 1 is not considered prime by definition
log 2.isPrime()
// true
// 2 is the smallest and only even prime number
// Negative numbers and zero are not prime
log (-7).isPrime()
// false
log 0.isPrime()
// false
