It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 409 502 is not a prime number.
For example, 409 502 can be divided by 2: 409 502 / 2 = 204 751.
For 409 502 to be a prime number, it would have been required that 409 502 has only two divisors, i.e., itself and 1.
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409 502 is an even number, because it is evenly divisible by 2: 409 502 / 2 = 204 751.
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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 409 502 is about 639.923.
Thus, the square root of 409 502 is not an integer, and therefore 409 502 is not a square number.
The square of a number (here 409 502) is the result of the product of this number (409 502) by itself (i.e., 409 502 × 409 502); the square of 409 502 is sometimes called "raising 409 502 to the power 2", or "409 502 squared".
The square of 409 502 is 167 691 888 004 because 409 502 × 409 502 = 409 5022 = 167 691 888 004.
As a consequence, 409 502 is the square root of 167 691 888 004.
The multiples of 409 502 are all integers evenly divisible by 409 502, that is all numbers such that the remainder of the division by 409 502 is zero. There are infinitely many multiples of 409 502. The smallest multiples of 409 502 are: