It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 429 is not a prime number.
For example, 216 429 can be divided by 3: 216 429 / 3 = 72 143.
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For 216 429 to be a prime number, it would have been required that 216 429 has only two divisors, i.e., itself and 1.
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216 429 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 216 429 is about 465.219.
Thus, the square root of 216 429 is not an integer, and therefore 216 429 is not a square number.
The square of a number (here 216 429) is the result of the product of this number (216 429) by itself (i.e., 216 429 × 216 429); the square of 216 429 is sometimes called "raising 216 429 to the power 2", or "216 429 squared".
The square of 216 429 is 46 841 512 041 because 216 429 × 216 429 = 216 4292 = 46 841 512 041.
As a consequence, 216 429 is the square root of 46 841 512 041.
The multiples of 216 429 are all integers evenly divisible by 216 429, that is all numbers such that the remainder of the division by 216 429 is zero. There are infinitely many multiples of 216 429. The smallest multiples of 216 429 are: