No, 505 is not a Prime number.
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727. The smallest palindromic number greater than 500 independent of primicity is 505.
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The factors of 5555 are 1, 5, 11, 55, 101, 505, 1111, and 5555. The prime factors of 5555 are 5, 11, and 101.
A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.
101 is a prime number. The only factor of 101 is itself and 1.prime