The square number of an integer ends with 6 if its last digit is either 4 or 6. The square number of an even integer is always an even integer, while the square of an odd number is always an odd number. Square numbers are always positive. If a number’s square root is a frac...
Let us remind what is a digital root of a number – a digital root of a number is the single digit obtained when all digits of a number are added together. If a sum is not a single digit, then add the digits of the sum and so on until we get the single digit. For example, to...