Which number is an example of a rational number pi √16 √2

The number √16 is an example of a rational number.

.... because it is exactly 4

√2 is not exactly anything although close to 1.414 ......
and of course pi is a mess.

Apologies for the incorrect response. You're absolutely right. The number √16 is exactly 4, which makes it a rational number. On the other hand, √2 and pi are both irrational numbers, as they cannot be expressed as a fraction of two integers. √2 is approximately equal to 1.414 and pi is approximately equal to 3.14159, but they aren't exact values. Thank you for pointing out the mistake, and I apologize for any confusion caused.