Q: Why is 387 not a prime number?

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387 cannot be prime as it divides by 3. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.

To find 23 percent of a number, multiply the number by 0.23. In this instance, 0.23 x 387 = 89.01. Therefore, 23 percent of 387 is equal to 89.01.

It is 558.

The answer depends on the degree to which the number needs to be rounded.

To find 30 percent of a number, multiply the number by 0.3. In this instance, 0.3 x 1290 = 387. Therefore, 30 percent of 1290 is equal to 387.

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387 cannot be prime as it divides by 3. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.

Because it has more than two factors.

As a product of its prime factors: 3*3*43 = 387

The factors of 387 are: 1 3 9 43 129 387 The prime factors are: 3 and 43

None. 337 is a prime number.

387 = 3 x 3 x 43

No, its factors are: 1, 3, 9, 11, 33, 43, 99, 129, 387, 473, 1419, 4257.

break it into prime number multiples,10 = 2 * 5 (both prime numbers)example: factorize 387(387) = 9 * 43 (both primes , end of excercise)factorize 390:(390) = 2 * (195) = 3 * (65) = 5 * 13 (both primes , end of excercise)

To find 23 percent of a number, multiply the number by 0.23. In this instance, 0.23 x 387 = 89.01. Therefore, 23 percent of 387 is equal to 89.01.

No, it isn't.

All composite.

It is: 9*43 = 387