There are no multiples of 5 that are prime.
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It is prime because its multiples are 1 and itself that is a prime number
There are only two multiples of five. The multiples are 1 and 5. 5 is a prime number. A prime number is when a number is or can only be multiplied by one or itself. (In this case itself is five.)
Multiples of 3: 123, 45, 6, 78, and 90 Multiples of 7: 7, 14, 28, 56, and 903 Primes: 5, 23, 41, 67, and 809
245 is not prime. Composite: (5 x 49 or 5 x 7 x 7) Also you can automatically determine a number as composite if: it ends with 2, 4, 6, 8, and 0: multiples of 2; or it ends with 5: multiples of 5.
All of the numbers that end in 5 are multiples of 5 which means that they have more than two factors.