Is √ 4/9 a rational number

yes

Step-by-step explanation:

Recall that a rational number is a number that results from dividing 2 integers

I'm not sure if your question refers to (√4) / 9 or √ (4/9), but either way both are rational numbers:

If (√4) / 9, Then,

(√4) / 9

= 2/9

Since both 2 and 9 are integers, then 2/9 is a rational number

If √ (4 / 9), Then,

√ (4 / 9)

= √4 / √9

= 2/3

Since both 2 and 3 are integers, then 2/3 is also a rational number