It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 438 009 is not a prime number.
For example, 438 009 can be divided by 3: 438 009 / 3 = 146 003.
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For 438 009 to be a prime number, it would have been required that 438 009 has only two divisors, i.e., itself and 1.
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438 009 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 438 009 is about 661.822.
Thus, the square root of 438 009 is not an integer, and therefore 438 009 is not a square number.
The square of a number (here 438 009) is the result of the product of this number (438 009) by itself (i.e., 438 009 × 438 009); the square of 438 009 is sometimes called "raising 438 009 to the power 2", or "438 009 squared".
The square of 438 009 is 191 851 884 081 because 438 009 × 438 009 = 438 0092 = 191 851 884 081.
As a consequence, 438 009 is the square root of 191 851 884 081.
The multiples of 438 009 are all integers evenly divisible by 438 009, that is all numbers such that the remainder of the division by 438 009 is zero. There are infinitely many multiples of 438 009. The smallest multiples of 438 009 are: