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The more numbers, the more refined it is. For example, a four digit grid coordinate will put you in a 1,000 meter grid square. A six digit grid will put you within a 100 meters of your position (or target), etc.
100 meters
what do you mean
105
The largest 5 digit perfect square is 99856 = 3162
16, which is the square of 4, is a two digit even number.
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.
The largest 3 digit square number is 961 because 31*31 = 961
10
The largest 3-digit number - not itself a perfect square - is 999. Calculate its square root, round the answer down, then square the answer again.
Every square of a 4 digit number has more than four digits.
There is no last digit in the square root of 2. It is an irrational number - and continues forever.