How do I get the constant "e" ?

[batx27]

Hey everyone,
I'm learning pre-calc currently, and I've been trying to figure how to use the constant "e", which is valued at around 2.7...... I would use the value itself, but its too long and I get really confused with more numbers.

On my Ti 84, there's a button called "e^y", which uses the constant "e". I can't find it on my hp prime G2. I used the regular letter e but that did not work. Is there an "e" on the Hp prime g2?