Power Prep II QC question Hard Section

n is an integer and n2 < 39

Quantity A: The greatest possible value of n minus the least possible value of n

Quantity B: 12

My Approach:
greatest value of n = 6.2
least value of n = -6.2

In the above case A is the answer but the answer is C
greatest value = 6
least value = -6

Hi! Can someone explain why n cannot be 6.2?
Thanks in advance

6.2 is not an integer.

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