Yes. A whole number is any number (positive or negative) that doesn't have a fraction or decimal. Some examples of whole numbers are 2, -2, 5, 7, 19943.
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19 is a whole number, so the answer is 19.
Try dividing the number by 19. If the answer is a whole number (with no remainder), then the number is divisible by 19.
21.6842
19
19 is it