How many shares are there in a call option?

The standard is 100 shares. If you want more than 100 shares, you've got to buy multiple contracts. This has a big advantage: if you own 10 calls that will be profitable if the stock hits $15 per share and the stock hits $16.50, and you think it'll go higher, you can exercise some of the calls to lock in your profit, and hang onto some to try making more money.