You need to look at the main page of your passport in order to find your passport number. Look for a 9-digit number at the upper right hand corner. The same page will provide your information as well as your picture. Take note that this 9-digit number will be very useful in confirming your identity. It will also confirm your current citizenship and status. With these details, you will be able to travel from one country to another.
Take note that the strength of passports will change depending on your country. Some passports are meant to be stronger than others which means you do not need to get a Visa depending on the country you will visit.