It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 109 is not a prime number.
For example, 402 109 can be divided by 23: 402 109 / 23 = 17 483.
For 402 109 to be a prime number, it would have been required that 402 109 has only two divisors, i.e., itself and 1.
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402 109 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 402 109 is about 634.121.
Thus, the square root of 402 109 is not an integer, and therefore 402 109 is not a square number.
The square of a number (here 402 109) is the result of the product of this number (402 109) by itself (i.e., 402 109 × 402 109); the square of 402 109 is sometimes called "raising 402 109 to the power 2", or "402 109 squared".
The square of 402 109 is 161 691 647 881 because 402 109 × 402 109 = 402 1092 = 161 691 647 881.
As a consequence, 402 109 is the square root of 161 691 647 881.
The multiples of 402 109 are all integers evenly divisible by 402 109, that is all numbers such that the remainder of the division by 402 109 is zero. There are infinitely many multiples of 402 109. The smallest multiples of 402 109 are: