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 About Zero, a selection of answers from the Dr. Math archives. Dividing by 0 - Dr. Math FAQ Why can't you divide by 0? Why is 0/0 "indeterminate" and 1/0 "undefined"? Why is dividing by zero "illegal"? Integers, Rational & Irrational Numbers - Dr. Math FAQ What is an integer?... From the archives: Is Zero Even? The justification that 0 is an even number is based on the fact that 0 is divisible by 2. But how many times does 2 go into 0? Is Zero Odd or Even? My 4th grade students are not satisfied with any explanation I can offer. Is Zero Even, Odd, or Neither? Two students bet on whether zero is even, or neither even nor odd. Is Zero Prime or Composite? Is zero prime, composite, or neither? Is Zero a Number? Why is 0 classified as a whole number and not a natural number? Why is Zero Not a Natural Number? Can you explain why the natural numbers are {1, 2, 3...}? Also, is there a way to prove that zero is an integer? Is Zero a Signed Number? What is the sign of zero? Is Zero a Square Number? Is zero considered to be a square number? I have found some sources that say it is, and others that say it isn't. Is Zero a Multiple of Every Number? Is zero a multiple of every number? I have some books that say it is, and others that say it isn't. Difference Between Zero and Nothing What is the difference between zero and nothing?