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Required answer: -10 is an integer, a rational number, and a real number.
Detailed solution:
Let's first take a look at all the sets out there.

SETS
Whole Numbers - This set consists of all positive numbers and zero.
Integers - This set is for whole numbers and negative numbers.
Rational Numbers - All numbers that can be expressed as fractions belong here.
Irrational Numbers - This set is for numbers that are the total opposite of rational, i.e., they cannot be shown as fractions.
Real Numbers - This set includes all of the above.

Now, what kind of a number is -10?
- It's an integer.
- It's a rational number, because it can be written as a fraction: -10/1.
- It's a real number.
∴ -10 is an integer, a rational number, and a real number.

Have a wonderful day!
