Most likely a calculator is your best bet for odd numbers. There are many common squares and many common square roots, such as : 1 squared =1 2 squared =4 3 squared = 9 4 squared =16 5 squared = 25 6 squared = 36 and so on... same with square roots root 25 is equal to 5 root 16 is equal to 4 root 9 is equal to 3 root 4 is equal to 2 and so on however not every number works out that way so a calculator is often your best bet to find the exact value
