A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
The numbers you've provided are:
- 39: Not prime (divisible by 3 and 13)
- 69: Not prime (divisible by 3 and 23)
- 29: Prime (only divisible by 1 and 29)
- 49: Not prime (divisible by 7)
Therefore, the number classified as a prime is 29.