The square root
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cube root
prime number
A prime number has only two factors - 1 and itself.this is called a prime number. any number that has the only only two factors of one and itself is prime.
All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number.
Here are some factors of 16:1,2,4,8,16.A factor of a number is a number that when you multiply it with a number it will equal the other number for example 1 is a factor of 16 because 16x1=16.