It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 311 339 is not a prime number.
For example, 402 311 339 can be divided by 19: 402 311 339 / 19 = 21 174 281.
For 402 311 339 to be a prime number, it would have been required that 402 311 339 has only two divisors, i.e., itself and 1.
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402 311 339 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 402 311 339 is about 20 057.700.
Thus, the square root of 402 311 339 is not an integer, and therefore 402 311 339 is not a square number.
The square of a number (here 402 311 339) is the result of the product of this number (402 311 339) by itself (i.e., 402 311 339 × 402 311 339); the square of 402 311 339 is sometimes called "raising 402 311 339 to the power 2", or "402 311 339 squared".
The square of 402 311 339 is 161 854 413 487 972 928 because 402 311 339 × 402 311 339 = 402 311 3392 = 161 854 413 487 972 928.
As a consequence, 402 311 339 is the square root of 161 854 413 487 972 928.
402 311 339 is a number with 9 digits.
The multiples of 402 311 339 are all integers evenly divisible by 402 311 339, that is all numbers such that the remainder of the division by 402 311 339 is zero. There are infinitely many multiples of 402 311 339. The smallest multiples of 402 311 339 are: