It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 709 is not a prime number.
For example, 402 709 can be divided by 283: 402 709 / 283 = 1 423.
For 402 709 to be a prime number, it would have been required that 402 709 has only two divisors, i.e., itself and 1.
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402 709 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 402 709 is about 634.594.
Thus, the square root of 402 709 is not an integer, and therefore 402 709 is not a square number.
The square of a number (here 402 709) is the result of the product of this number (402 709) by itself (i.e., 402 709 × 402 709); the square of 402 709 is sometimes called "raising 402 709 to the power 2", or "402 709 squared".
The square of 402 709 is 162 174 538 681 because 402 709 × 402 709 = 402 7092 = 162 174 538 681.
As a consequence, 402 709 is the square root of 162 174 538 681.
The multiples of 402 709 are all integers evenly divisible by 402 709, that is all numbers such that the remainder of the division by 402 709 is zero. There are infinitely many multiples of 402 709. The smallest multiples of 402 709 are: