It is: 235+120 = 355
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It is a composite number because it has more than two factors
235 is itself a real number.
235 is a composite number because it has more than two divisors - contrary to a prime which has exactly two divisors: 1 and the prime itself. 235 has 4 divisors: 1, 5, 47 and 235. A quick way to determine this is done by looking at the last digit. If it is either 0 or 5 the number is divisible by 5, thus it is not a prime.
The number is bigger than 5 but ends in 5 so it is divisible by 5. Therefore it cannot be a prime.
If you mean: 2, 3 and 5 then they are 71, 73, 77 and 79