Video: Using a Table of Factors to Identify Prime Numbers

The table shows all the factors of some numbers. Which of the numbers are prime?

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Video Transcript

The table shows all the factors of some numbers. Which of the numbers are prime?

A prime number is divisible only by itself and one. Another way to say that is that only factors of prime numbers are itself and one. Which values on this table only have factors of itself and one?

101 is only divisible by one and 101. 157 is only divisible by one and 157. This means that, out of this list, 101 and 157 are the prime numbers.

133 has more than two factors. And 145 has more than two factors. This means they are composite numbers not prime numbers.

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