3 and 41
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When multiplied together, 3 and 41 equal 123.
3 X 41
two numbers which are equal to 123:123 + 0122 + 1121 + 2120 + 3 ...
To calculate manually if any number is a prime number, divide the number by ascending prime numbers until you reach the square root of the number. In this instance: 123/2 = 61.5 123/3 = 41 Therefore, 123 is not a prime number. However, since the first two factors we discovered are both prime - those being 3 and 41, it must not have any other factors.
It is impossible for the product of two prime numbers to be prime. It is impossible for the sum of two prime numbers to be prime as long as one of the numbers isn't 2.