Every integer is also a rational number and a real number.
It is an integer. All integers are rational but not irrational. All rational and irrational numbers are real numbers.
No, 3.4 is not an integer. It is a rational number and a real number, but not an integer.
It is a real rational negative integer number whose value is -3
Every integer is all three.
45 is real, rational, whole, natural, odd, composite, and an integer.