Well 2.7182818284 is from euler's constant e.
Integers are whole numbers positive and negative. since 2.7182818284 is positive (and you can't take square root of negative number) the integers we find will be positive.
List out square roots.
sqrt1 = 1
sqrt 2 = 1.41
sqrt 3 = 1.73
sqrt 4 = 2
sqrt 5 = 2.2
sqrt 6 = 2.4
sqrt 7 = 2.6
sqrt 8 = 2.8 -----> this is over the constant.
so it's between the square root of 7 and 8