For 30 to be an integer, 30 has to be a whole number. Furthermore, for 30 to be an integer, you should be able to write 30 without a fractional or decimal component.
30 is a whole number that can be written without a fractional component, thus 30 is an integer.
The answer to the question: "Is 30 an integer?" is YES.
Integer?
Check other numbers to see if they are integers.
Is 31 an Integer?
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Is 30 a prime number?
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