Any number times itself is a square number.
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It is all three.
It is all of them.
No. A mixed number is one where there is a whole number and a fraction. If the whole number is 0 there is no whole number and all that remains is the fraction. All improper (top heavy) fractions can be converted to a mixed number.
There does not exist a number that is divisible by all integers. The opposite is true. The number one can divided into all integers.
No.