One can determine if a number is a integer through a simple mathematical formula. The formula itself can be found on popular websites such as php and other math resources.
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NO, it is a rational number but NOT an integer.
A composite number is a positive integer with more than two factors.
A rational number is one that can be expressed as one integer (whole number) over another integer. 4.89 = 489 ÷ 100 = 489/100 In this form 489 is an integer and 100 is an integer, so 4.89 can be expressed as one integer over another integer, thus it is a rational number.
A prime number is a positive integer with two factors: one and the number itself. If you test the numbers up to the square root and your number is not divisible by any of them, it's prime.