It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 212 491 is not a prime number.
For example, 212 491 can be divided by 37: 212 491 / 37 = 5 743.
For 212 491 to be a prime number, it would have been required that 212 491 has only two divisors, i.e., itself and 1.
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212 491 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 212 491 is about 460.967.
Thus, the square root of 212 491 is not an integer, and therefore 212 491 is not a square number.
The square of a number (here 212 491) is the result of the product of this number (212 491) by itself (i.e., 212 491 × 212 491); the square of 212 491 is sometimes called "raising 212 491 to the power 2", or "212 491 squared".
The square of 212 491 is 45 152 425 081 because 212 491 × 212 491 = 212 4912 = 45 152 425 081.
As a consequence, 212 491 is the square root of 45 152 425 081.
The multiples of 212 491 are all integers evenly divisible by 212 491, that is all numbers such that the remainder of the division by 212 491 is zero. There are infinitely many multiples of 212 491. The smallest multiples of 212 491 are: