It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 376 429 is not a prime number.
For example, 376 429 can be divided by 337: 376 429 / 337 = 1 117.
For 376 429 to be a prime number, it would have been required that 376 429 has only two divisors, i.e., itself and 1.
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376 429 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 376 429 is about 613.538.
Thus, the square root of 376 429 is not an integer, and therefore 376 429 is not a square number.
The square of a number (here 376 429) is the result of the product of this number (376 429) by itself (i.e., 376 429 × 376 429); the square of 376 429 is sometimes called "raising 376 429 to the power 2", or "376 429 squared".
The square of 376 429 is 141 698 792 041 because 376 429 × 376 429 = 376 4292 = 141 698 792 041.
As a consequence, 376 429 is the square root of 141 698 792 041.
The multiples of 376 429 are all integers evenly divisible by 376 429, that is all numbers such that the remainder of the division by 376 429 is zero. There are infinitely many multiples of 376 429. The smallest multiples of 376 429 are: