/**
 * Integer square root
 *
 * @author Jim Ulery (attributed on hextreme)
 * @see https://en.wikipedia.org/wiki/Integer_square_root
 * @see https://git.immc.ucl.ac.be/hextreme/hxt_seqdel/-/blob/master/src/hxt_tetrahedra.c#L54
 *
 * @param {number} input
 * @returns {number}
 */
export function isqrt(input: number): number;
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