It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 335 991 is not a prime number.
For example, 335 991 can be divided by 3: 335 991 / 3 = 111 997.
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For 335 991 to be a prime number, it would have been required that 335 991 has only two divisors, i.e., itself and 1.
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335 991 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 335 991 is about 579.647.
Thus, the square root of 335 991 is not an integer, and therefore 335 991 is not a square number.
The square of a number (here 335 991) is the result of the product of this number (335 991) by itself (i.e., 335 991 × 335 991); the square of 335 991 is sometimes called "raising 335 991 to the power 2", or "335 991 squared".
The square of 335 991 is 112 889 952 081 because 335 991 × 335 991 = 335 9912 = 112 889 952 081.
As a consequence, 335 991 is the square root of 112 889 952 081.
The multiples of 335 991 are all integers evenly divisible by 335 991, that is all numbers such that the remainder of the division by 335 991 is zero. There are infinitely many multiples of 335 991. The smallest multiples of 335 991 are: