well, then, try a dip?

2021 is a year number that is not prime.

17368 is the number of days I have been alive. Also, not a prime number.

3 is the number of children I have, yes, a prime number.

6 is the date today that I post this post in January; it is double a prime number.

299,792,458 m/s is the speed of light, not a prime number.

7.21436 AU/h is also the speed of light; and usually prime numbers are expressed as integers.