For any natural number, let's call the numbers formed from its digits and have the same "digit" arrangement with the initial number as the "partial numbers". For example, the partial numbers of $149$ are ${1, 4, 9, 14,19, 49, 149},$ and the partial numbers of $313$ are ${3, 1, 31,33, 13, 313}.$ Find all natural numbers whose partial numbers are all prime. Justify your opinion.
To solve this problem, we need to find all natural numbers whose partial numbers are all prime. Let's break down the solution step by step.

1. **Identify the possible digits:**
   - Since all partial numbers must be prime, the digits of the number must themselves be prime. The prime digits are \(2, 3, 5, 7\).

2. **Single-digit numbers:**
   - The single-digit prime numbers are \(2, 3, 5, 7\). These are trivially prime.

3. **Two-digit numbers:**
   - Consider two-digit numbers formed from the digits \(2, 3, 5, 7\). We need to check if both the number itself and its individual digits are prime.
   - Possible combinations are \(23, 25, 27, 32, 35, 37, 52, 53, 57, 72, 73, 75\).
   - Checking each:
     - \(23\) (both \(2\) and \(3\) are prime, and \(23\) is prime)
     - \(25\) (both \(2\) and \(5\) are prime, but \(25\) is not prime)
     - \(27\) (both \(2\) and \(7\) are prime, but \(27\) is not prime)
     - \(32\) (both \(3\) and \(2\) are prime, but \(32\) is not prime)
     - \(35\) (both \(3\) and \(5\) are prime, but \(35\) is not prime)
     - \(37\) (both \(3\) and \(7\) are prime, and \(37\) is prime)
     - \(52\) (both \(5\) and \(2\) are prime, but \(52\) is not prime)
     - \(53\) (both \(5\) and \(3\) are prime, and \(53\) is prime)
     - \(57\) (both \(5\) and \(7\) are prime, but \(57\) is not prime)
     - \(72\) (both \(7\) and \(2\) are prime, but \(72\) is not prime)
     - \(73\) (both \(7\) and \(3\) are prime, and \(73\) is prime)
     - \(75\) (both \(7\) and \(5\) are prime, but \(75\) is not prime)
   - Valid two-digit numbers: \(23, 37, 53, 73\).

4. **Three-digit numbers:**
   - Consider three-digit numbers formed from the digits \(2, 3, 5, 7\). We need to check if the number itself and all its partial numbers (including two-digit and single-digit) are prime.
   - Possible combinations are \(237, 273, 327, 372, 523, 527, 573, 723, 725, 732, 735, 753\).
   - Checking each:
     - \(237\) (contains \(2, 3, 7, 23, 37, 237\); \(237\) is not prime)
     - \(273\) (contains \(2, 7, 3, 27, 73, 273\); \(273\) is not prime)
     - \(327\) (contains \(3, 2, 7, 32, 27, 327\); \(327\) is not prime)
     - \(372\) (contains \(3, 7, 2, 37, 72, 372\); \(372\) is not prime)
     - \(523\) (contains \(5, 2, 3, 52, 23, 523\); \(52\) is not prime)
     - \(527\) (contains \(5, 2, 7, 52, 27, 527\); \(52\) is not prime)
     - \(573\) (contains \(5, 7, 3, 57, 73, 573\); \(57\) is not prime)
     - \(723\) (contains \(7, 2, 3, 72, 23, 723\); \(72\) is not prime)
     - \(725\) (contains \(7, 2, 5, 72, 25, 725\); \(72\) is not prime)
     - \(732\) (contains \(7, 3, 2, 73, 32, 732\); \(32\) is not prime)
     - \(735\) (contains \(7, 3, 5, 73, 35, 735\); \(35\) is not prime)
     - \(753\) (contains \(7, 5, 3, 75, 53, 753\); \(75\) is not prime)
   - No valid three-digit numbers.

5. **Four or more digit numbers:**
   - For any number with four or more digits, there will always be a three-digit partial number. Since we have shown that no three-digit number formed from \(2, 3, 5, 7\) has all prime partial numbers, it follows that no four or more digit number can have all prime partial numbers.

Conclusion:
The only natural numbers whose partial numbers are all prime are \(2, 3, 5, 7, 23, 37, 53, 73\).

The final answer is \( \boxed{ \{2, 3, 5, 7, 23, 37, 53, 73\} } \).