How does finding a cube root differ from finding a square root of a positive integer? how do the answers differ?

The cube root and the square root all have to multiply by itself a certain amount of time to find the number you are trying to find the root of. I know it's hard to understand by word but let's just find the square root of 25. It would equal to 5. And the cube root of 25 would be 2.924017738212866. For square root u have to multiply the root by itself twice to got the original number(5*5=25). And cube root you have to multiply the root by itself three times, 2.924017738212866*2.924017738212866*2.924017738212866=25.00000000000001. But the calculator only goes out so far so it just rounds to 25