If the sum of digits of a number is a multiple of 3 then it is divisible by 3.
Sum of digits of 234567 = 2+3+4+5+6+7 = 27 = 3x9
So, 234567 is not a Prime number because it is divisible by 3.
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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
19 is a prime number.19 is a prime number.19 is a prime number.19 is a prime number.
37 is an odd prime number