How about: 73+5 = 78
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78 is not prime. No even number (except 2) is prime. Remember the definition. A prime number is exactly divisible only by itself and 1.
47 is a prime number.
The answer is 13.
The prime factors of 78 are 2, 3, and 13. To find the prime factors of a number, you can start by dividing the number by the smallest prime number, which is 2. If the number is divisible by 2, continue dividing by 2 until you reach a point where it is no longer divisible by 2. Then, move on to the next prime number, which is 3. Repeat the process until you have factored the number completely into its prime factors.
As a product of its prime factors: 2*3*13 = 78