Answer:
The quick answer:  No.
Explanation:
 (pinquancaro)
Given : Number 0.040040004..... 
 
To find : Is the number is rational or irrational ? 
 
Solution : 
 
Rational number is defined as number written in form of p/q where p and q are integers and q is non-zero. 
 
Rational number is terminating and repeating. 
 
Irrational number is defined as number which cannot be written in form of p/q. 
 
Irrational number is non-terminating and non-repeating. 
 
The number given is 0.040040004..... is non-terminating and non-repeating. 
 
Therefore, The number 0.040040004..... is an irrational number.