First, a integer is a whole number positive or negative.
For example: 2,5,7,2000000,10,400,-10,-400,2848993
These are all integers.
A rational number is a real number that can be described by a integer:
2, 57 6747374
These are all rational numbers.
Extra:
A irrational number is a real number that can’t be described with a integer.
For example,
Square root of 3. Square root of 5 etc
Hope this helped