It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 427 438 is not a prime number.
For example, 427 438 can be divided by 2: 427 438 / 2 = 213 719.
For 427 438 to be a prime number, it would have been required that 427 438 has only two divisors, i.e., itself and 1.
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427 438 is an even number, because it is evenly divisible by 2: 427 438 / 2 = 213 719.
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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 427 438 is about 653.787.
Thus, the square root of 427 438 is not an integer, and therefore 427 438 is not a square number.
The square of a number (here 427 438) is the result of the product of this number (427 438) by itself (i.e., 427 438 × 427 438); the square of 427 438 is sometimes called "raising 427 438 to the power 2", or "427 438 squared".
The square of 427 438 is 182 703 243 844 because 427 438 × 427 438 = 427 4382 = 182 703 243 844.
As a consequence, 427 438 is the square root of 182 703 243 844.
The multiples of 427 438 are all integers evenly divisible by 427 438, that is all numbers such that the remainder of the division by 427 438 is zero. There are infinitely many multiples of 427 438. The smallest multiples of 427 438 are: