Prime Tossing Game

You toss a coin 5 times and take note of what comes up by writing 1 if Heads comes up and 0 if Tails comes up. You write those 1's and 0's next to each other creating a binary number of length 5.

Example: Heads, Heads, Tails, Tails, Heads $\rightarrow 11001_{2}$ .

What is the chance of that number being a prime number?