It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 609 is not a prime number.
For example, 402 609 can be divided by 3: 402 609 / 3 = 134 203.
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For 402 609 to be a prime number, it would have been required that 402 609 has only two divisors, i.e., itself and 1.
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402 609 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 402 609 is about 634.515.
Thus, the square root of 402 609 is not an integer, and therefore 402 609 is not a square number.
The square of a number (here 402 609) is the result of the product of this number (402 609) by itself (i.e., 402 609 × 402 609); the square of 402 609 is sometimes called "raising 402 609 to the power 2", or "402 609 squared".
The square of 402 609 is 162 094 006 881 because 402 609 × 402 609 = 402 6092 = 162 094 006 881.
As a consequence, 402 609 is the square root of 162 094 006 881.
The multiples of 402 609 are all integers evenly divisible by 402 609, that is all numbers such that the remainder of the division by 402 609 is zero. There are infinitely many multiples of 402 609. The smallest multiples of 402 609 are: