4 and 4
2 and 8
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5 and 1
144 Divide by two. 72,2 Divide by two. 36,2,2 Divide by two. 18,2,2,2 Divide by two. 9,2,2,2,2 Divide by three. 3,3,2,2,2,2 Stop. 2 x 2 x 2 x 2 x 3 x 3 = 144
Except for 2, all other prime numbers are odd. The sum of any two odd numbers is even. Therefore, the prime number 2 will evenly divide the sum of any other two prime numbers. Here are some examples to illustrate this: 3 + 5 = 8 which is evenly divisible by 2 13 + 19 = 32 which is evenly divisible by 2 43 + 47 = 90 which is evenly divisible by 2
mainly 3 and 131 is prime - it has no proper divisors.So the only way to divide up 31 evenly is into 1 or into 31.
588 Divide by two. 294,2 Divide by two. 147,2,2 Divide by three. 49,3,2,2 Divide by seven. 7,7,3,2,2 Stop. 2 x 2 x 3 x 7 x 7 = 588