There are 31 of them. You can find them easily on your own, like this:
-- On a piece of paper, write the numbers from 1 to 31 in a vertical column ...
down the side of the paper.
-- Start with ' 1 '. Multiply each number by itself, and write the result next to it.
-- Next to 1, you'll write '1'. Next to '2', you'll write '4'. Next to '3', you'll write '9'.
Keep going like that, one at a time, all the way down your list of numbers.
-- When you get down to 31, you'll write '961' next to it, and that'll be the biggest
perfect square number that's less than 1,000 . The next one is 1,024.
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I suggest you try to split the number up into prime factors. It should then be clear what the largest square factor is - simply look for repeated prime factors.
A meter is about 3.3 ft long. So a square meter would be about = 3.3^2 = 10.89 ft^2. NOTE that's square feet (ft^2). Approximately. You can look up more precise numbers if you need them.
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The interior angles of a square add up to 360 degrees.
Assuming that that you are just going to travel from point A to point B in a straight line, all 8000 of the acres are perfect squares and you are intersecting them all at the same right angle, ie. you are walking in a perfectly straight line from south to north and all the perfectly square acres are lined up from south to north, the answer is, approximately, 316.2. A perfect square mile is 25.3 acres long by 25.3 acres wide. 8000 divided by 25.3 equals 316.2.