A positive integer is called [i]cool[/i] if it can be expressed in the form $a!\cdot b!+315$ where $a,b$ are positive integers. For example, $1!\cdot 1!+315=316$ is a cool number. Find the sum of all cool numbers that are also prime numbers.

[i]Proposed by Evan Fang
1. We start by noting that a positive integer \( n \) is called *cool* if it can be expressed in the form \( a! \cdot b! + 315 \) where \( a \) and \( b \) are positive integers.
2. We need to find the sum of all cool numbers that are also prime numbers.
3. First, observe that \( 315 = 3^2 \cdot 5 \cdot 7 \). This means that any cool number \( n = a! \cdot b! + 315 \) must be checked for primality.
4. Without loss of generality, assume \( a \leq b \). This simplifies our search since we only need to consider cases where \( a \leq b \).

### Case Analysis:
- **Case 1: \( a = 1 \)**
  - If \( a = 1 \), then \( n = 1! \cdot b! + 315 = b! + 315 \).
  - Check for \( b = 1 \):
    \[
    n = 1! \cdot 1! + 315 = 1 + 315 = 316 \quad (\text{not prime})
    \]
  - Check for \( b = 2 \):
    \[
    n = 1! \cdot 2! + 315 = 2 + 315 = 317 \quad (\text{prime})
    \]
  - Check for \( b = 3 \):
    \[
    n = 1! \cdot 3! + 315 = 6 + 315 = 321 \quad (\text{not prime, divisible by 3})
    \]
  - For \( b \geq 4 \), \( b! \) grows very quickly, and the resulting number \( b! + 315 \) will be much larger and not prime.

- **Case 2: \( a = 2 \)**
  - If \( a = 2 \), then \( n = 2! \cdot b! + 315 = 2 \cdot b! + 315 \).
  - Check for \( b = 2 \):
    \[
    n = 2! \cdot 2! + 315 = 4 + 315 = 319 \quad (\text{not prime, divisible by 11})
    \]
  - Check for \( b = 3 \):
    \[
    n = 2! \cdot 3! + 315 = 12 + 315 = 327 \quad (\text{not prime, divisible by 3})
    \]
  - For \( b \geq 4 \), \( 2 \cdot b! \) grows very quickly, and the resulting number \( 2 \cdot b! + 315 \) will be much larger and not prime.

- **Case 3: \( a \geq 3 \)**
  - For \( a \geq 3 \), \( a! \) grows very quickly, and the resulting number \( a! \cdot b! + 315 \) will be much larger and not prime.

### Conclusion:
The only cool number that is also a prime number is \( 317 \).

The final answer is \(\boxed{317}\).