399 is not a Prime number because it has more than two factors which can be shown by the prime factorization of 399 i.e. P.F. of 399 = 3x7x19.
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No, 399 is not a prime number. It is divisible by 3 and 133, in addition to 1 and itself.
399*1 = 399. So 399 is divisible by 399. 399*2 = 798. So 798 is divisible by 399. 399*3 =1197. So 1197 is divisible by 399. 399*4 = 1596. So 1596 is divisible by 399.
7 is a prime number!
109 is a prime number.
167 is a prime number.
Yes. Because both 300 and 399 are multiples of 3, the fraction 300/399 can be reduced to 100/133. To quickly check for divisibility by 3, simply add up the digits of the number. If the result is divisible by 3, so is the original number. For example, 399 is divisible by 3 because 3 + 9 + 9 = 21 which is divisible by 3.