No, there are billions of them in the the entire universe. There are so many of them that they cannot be seen. The only way to observe one is to look at the curvature of light from distant galaxies. There is even an entirely larger breed of Black Holes, they are known as "Super Massive Black Holes" these bodies of unfathomable gravitational forces are usually found in the centre of each galaxy including our own.. Or from a estrela millions of times the body mass of our own sun goes supernova or hypernova, and leave behind a black hole.
Our own sun however will not leave behind a black hole as it is just not large enough to leave behind one. Given it's size and mass. It will however envelope the planets Mercury, Venus and possibly Earth, as it will run out of nuclear fuels and swell up about 50 to 100 times larger. Then it'll just shed all of it's mass over time, then once this process is complete, all that'll be left will be a small "White Dwarf" star. Billions of time smaller when it was a full grown star, but still weighs just as heavy.
As all of it's gravitational forces will be localised into a o espaço no larger than our moon. Where it's dimly shine for billions of years until when the universe arrives in the "Degenerate Epoch". Hope this respostas your pergunta EllaBrenda.
Here's an example of the nature of gravitational forces from a White Dwarf Star, imagine a small conventional car weighing say 6 tonnes, from the gravitational forces from a White Dwarf estrela it'll weight as much as Mount Everest. It's what's known as "Gravity gone Mad"
There is even occasions in the universe history where black holes even collide. To merge together to make an even larger black hole. This usually happens when galaxies collide with each other, or two stray black holes collide. Which can effect the mass and matter that may be near to their collision.
There is already a collision forecast with our own Galaxy, our neighbour galaxy Andromeda, however this even will not take place for a couple of billions of years time. So what of the Solar System when this event happens. Well there to two possibilities, that the entire Solar System could be flung out into the emptiness of o espaço and time, or worse it could be dragged into the maelstrom of colliding Super Massive Black Holes from the two colliding galaxies.