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Don't learn square or cube of some number means the two times or three times of that number respectively like 2² = 2 × 2 = 4 2³ = 2 × 2 × 2 = 8 3² = 3 × 3 = 9 3³ = 3 × 3 × 3 = 27 to do square root bigger values just prime factorize it like for number 17424 after prime factorization we get 17454 = 11 × 11 × 2 × 2 × 2 × 2 × 3 × 3 so square root =√(11 × 11 × 2 × 2 × 2 × 2 × 3 × 3) very very two same numbers under root you will get 1 number outside root that is = √(11 × 11 × 2 × 2 × 2 × 2 × 3 × 3) = 11× 2 × 2 × 3 =132 some time a case like this can happen like for square root of this number 98 so √98 =√( 2 × 7 × 7 ) = 7√2 now you require value of √2 which you can get by root division √2 = 1.414 so 7√2 = 7 × 1.414 = 9.898