The square root of 1 is 1. This is because the square root of a number is the value which when multiplied by itself gives the result as that number. For 1, its square root can be either 1 or -1 as both 1 multiplied by 1 and -1 multiplied by -1 gives the result as 1. However, when talking about square roots, only the positive square root is considered, which is 1 in this case.