The unit digit of the square of 81 will be 1.
As 3844 ends in 4, its square root (if a whole number) will end in 2 or 8. √3844 = 62 so the unit digit is 2.
9
Here's an example. In the number 382, the number 2 is the "unit's digit" (in the "unit's place"), 8 is the "ten's digit" (in the "ten's place"), and 3 is the "hundred's digit."
16, which is the square of 4, is a two digit even number.
Every square of a 4 digit number has more than four digits.
'5' is the UNIT digit. '6' is the 'tenths' digit. '9' is the 'hundredths' digit.
2.
One hundred is the least three-digit square number. It is formed by 102.
9,801 = 992Another possibility: The 4-digit number 9998. It's the square of 9949 .
If one digit is a prime number, that digit must be 2, 3, 5, or 7. If one digit is a square, that digit must be 1, 4, or 9. If one digit is neither a prime number or a square, that digit must be 0, 6, or 8. So, 248 is a possible number. Another possibility is 436. There are other possibilities, as well.
It is 63.