For 620 to be an integer, 620 has to be a whole number. Furthermore, for 620 to be an integer, you should be able to write 620 without a fractional or decimal component.
620 is a whole number that can be written without a fractional component, thus 620 is an integer.
The answer to the question: "Is 620 an integer?" is YES.
Integer?
Check other numbers to see if they are integers.
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Is 620 a prime number?
Now you know that 620 is an integer, but do you know if 620 is a prime number?
What are the factors of 620?
What are the factors of the integer 620 you ask?
Is 620 a square number?
Find out if 620 is a perfect square number!
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