Answer: It is between 3 and 4. 
Explanation:
Integers are whole numbers and its opposite, for example, -5,-4,-3,-2,-1, 0, 1,2,3,4, 5 ,.... 
Meaning that 3.4 is not an integer so it fall between two integers and those integers has to be positive because 3.4 is a positive number. 
3.4 is slightly greater than 3 but is less than 4. 
Meaning that 3.4 is between the integers 3 and 4.