For 399 to be an integer, 399 has to be a whole number. Furthermore, for 399 to be an integer, you should be able to write 399 without a fractional or decimal component.
399 is a whole number that can be written without a fractional component, thus 399 is an integer.
The answer to the question: "Is 399 an integer?" is YES.
Integer?
Check other numbers to see if they are integers.
Is 400 an Integer?
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More Information from Research Maniacs:
Is 399 a prime number?
Now you know that 399 is an integer, but do you know if 399 is a prime number?
What are the factors of 399?
What are the factors of the integer 399 you ask?
Is 399 a square number?
Find out if 399 is a perfect square number!
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