We aim to factorise the numerator. This would give 6c(c^2 + 5).
We then factorise the denominator. This would give 3(c^2 + 5).
Since (c^2 + 5) is present in both the numerator and denominator, it will cancel.
This leaves us with 6c/3, which simplifies to 2c.
This is an even number because 2 times a positive integer would give an even number.